Hall of Fame managers

http://www.baseball-reference.com/managers/

I noticed that five managers won two pennants and two WS:

Bill Carrigan Red Sox

Danny Murtaugh Pirates
Cito Gaston Blue Jays

Tom Kelly Twins
Terry Francona Red Sox

All with one team.

Sort the data on pennants won and you see it.

All managers with at least 3 pennants who are eligible are in HoF except:

Jim Mutrie 1883-1891
Ralph Houk 2 WS, 3 pennants
Charlie Grim 0 WS, 3 pennants

Look at the 8 with 3 pennants and explain why Ralph Houk is not in HoF.