Batting order position and success.

Only first and fourth really have names: leadoff and cleanup. Cleanup really puts pressure on batters. Few batters below fifth are significant. How many non-pitchers were MVP batting sixth?

Josh Donaldson was American Conference (AC) MVP in 2015 with 620 plate appearances (PA) batting second in his first season with Toronto. Teammate Jose Bautista hit 54 home runs in 2010 for Toronto:

Split	G	GS	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
Batting 1st	12	12	55	43	7	7	1	0	1	5	1	0	11	12	.163	.327	.256	.583	11	0	0	0	1	0	0	.194	28	66
Batting 2nd	2	2	10	8	0	1	1	0	0	0	0	1	2	2	.125	.300	.250	.550	2	1	0	0	0	0	0	.167	20	53
Batting 3rd	93	93	402	339	64	91	21	1	35	76	6	0	56	64	.268	.378	.646	1.024	219	6	5	0	2	0	4	.231	105	145
Batting 4th	3	3	14	14	1	5	0	0	1	4	0	0	0	2	.357	.357	.571	.929	8	0	0	0	0	0	0	.364	87	127
Batting 5th	14	14	56	44	7	9	3	1	3	6	0	1	11	13	.205	.375	.523	.898	23	0	1	0	0	1	0	.214	84	131
Batting 6th	11	11	42	34	8	10	3	0	4	10	0	0	7	5	.294	.429	.735	1.164	25	1	1	0	0	0	0	.240	133	208
Batting 7th	26	26	104	87	22	25	6	1	10	23	2	0	13	18	.287	.394	.724	1.118	63	2	3	0	1	1	1	.250	122	214

But in 2016 Bautista has 86 of 268  PA batting leadoff. Toronto leadoff batters in 2016:

BOP	Name	G	PA	AB	H	2B	3B	HR	RBI	BB	IBB	SO	HBP	SH	SF	ROE	GDP	BA	OBP	SLG	OPS	W	L
1	Kevin Pillar	20	92	86	17	6	1	0	8	1	0	14	3	1	1	1	2	.198	.231	.291	.521	9	11
1	Jose Bautista	19	86	74	19	4	0	5	12	12	0	11	0	0	0	0	4	.257	.360	.514	.874	12	7
1	Michael Saunders	18	79	68	18	5	0	3	5	11	0	24	0	0	0	0	0	.265	.367	.471	.838	8	10
1	Ezequiel Carrera	9	37	32	13	2	0	1	1	3	0	3	1	1	0	0	1	.406	.472	.562	1.035	5	4

In 1962 Yankee manager Ralph Houk batted Mickey Mantle leadoff in Mantle's final four games to give him a chance to qualify for leading the American League in batting average (BA). Mantle qualified but finished second. Career:

I	Split	G	GS	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+
	Batting 1st	82	78	351	312	55	91	14	1	14	62	6	2	37	59	.292	.367	.478	.844	149	1	0	2	0	5	6	.322	73
	Batting 2nd	63	55	256	215	40	47	5	3	10	30	4	3	41	56	.219	.344	.409	.753	88	5	0	0	0	1	2	.248	55
	Batting 3rd	1264	1262	5456	4463	916	1324	184	41	287	754	77	24	945	951	.297	.419	.549	.968	2451	67	11	11	26	69	60	.319	98
	Batting 4th	759	757	3228	2589	574	803	112	22	194	559	56	11	619	526	.310	.441	.595	1.036	1541	33	1	1	18	65	36	.323	112
	Batting 5th	109	105	454	380	75	113	19	3	22	72	8	1	72	87	.297	.407	.537	.944	204	5	0	0	2	8	6	.333	93
	Batting 6th	10	6	27	26	4	8	2	0	2	9	0	0	1	4	.308	.333	.615	.949	16	0	0	0	0	0	0	.300	90
	Batting 7th	17	5	33	30	0	6	2	2	0	1	0	1	3	11	.200	.273	.400	.673	12	2	0	0	0	0	0	.316	37
	Batting 8th	24	1	28	22	4	9	3	0	2	6	0	0	6	4	.409	.536	.818	1.354	18	0	0	0	0	0	0	.438	174
	Batting 9th	73	0	74	64	7	14	3	0	5	16	1	0	9	21	.219	.311	.500	.811	32	0	0	0	1	0	1	.231	64

Casey Stengel had started batting Mantle cleanup at the end of the 1960 season after Roger Maris emerged as a power hitter. Maris had batted leadoff in his first Yankee game but hit two homers and a double and was quickly dropped into a power spot.

Joe DiMaggio and Yogi Berra each won three MVP for the Yankees. DiMaggio batted cleanup in all three of those seasons. Berra moved around in 1951 his first MVP season:

I	Split	G	GS	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
	Batting 3rd	18	18	78	72	10	14	0	0	1	6	0	0	5	1	.194	.256	.236	.493	17	3	1	0		1	3	.186	21	24
	Batting 4th	23	23	100	95	9	27	5	2	4	15	1	0	5	1	.284	.320	.505	.825	48	1	0	0		1	1	.256	94	98
	Batting 5th	93	93	391	357	68	109	13	2	21	59	4	4	32	17	.305	.366	.529	.895	189	12	2	0		2	4	.276	112	125
	Batting 6th	6	6	23	22	5	11	1	0	1	8	0	0	1	1	.500	.522	.682	1.204	15	0	0	0		0	0	.500	188	229
	Batting 8th	1	0	2	1	0	0	0	0	0	0	0	0	1	0	.000	.500	.000	.500	0	0	0	0		0	0	.000	43	55

But Berra was cleanup in 1954. In 1955 PA:
4 - 401; Mantle 238
3 - 177; Mantle 347

Mantle was MVP three times. PA:
1956: 3. 519 4. 128
1957: 3. 277 4. 194
1962: 4. 482 1. 14

In 1950 Yankee SS Phil Rizzuto was AL MVP. Rizzuto is generally thought of as a leadoff batter but in 1950:

I	Split	G	GS	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
	Batting 1st	82	82	397	338	68	108	19	4	3	32	4	6	51	26	.320	.412	.426	.838	144	6	2	6		0	4	.340	96	122
	Batting 2nd	73	73	338	279	57	92	17	3	4	34	8	3	41	13	.330	.425	.455	.880	127	0	5	13		0	2	.336	105	140

Leadoff batters are probably the only MVP if they are shortstops.

Barry Larkin was NL MVP in 1995:

Split	G	GS	PA	AB	R	H	2B	3B	HR	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
Batting 1st	19	19	86	74	18	24	5	0	2	8	10	2	11	7	.324	.419	.473	.892	35	0	1	0	0	0	2	.338	102	138
Batting 2nd	63	63	264	237	45	73	14	4	7	25	29	3	21	23	.308	.366	.489	.856	116	4	2	2	2	0	5	.316	92	131
Batting 3rd	49	49	217	185	35	61	10	2	6	33	12	0	29	19	.330	.417	.503	.919	93	2	0	1	2	2	1	.340	108	115

Zoilo Veraslles was AL MVP in 1965 for the Twins leading the AL in 2B, 3B, TB; 716 PA batting leadoff.

Jackie Bradley outfielder with the Red Sox uncharacteristically batted leadoff May 26, 2016 and his 29 game hitting streak was stopped. During that streak Bradley mostly batted 9th and 8th. Towards the end Bradley was batting 7th, finally 6th in 2 of final 3; second once.

DiMaggio batted cleanup during his 1941 56 game hitting streak. That might have cost him some PA but not as much as Bradley batting way down.

I don't have an easy way to find the batting order position other than looking at individual players for a season. But I may try to find that for at least some who led their league in BA or HR.