Shohei Ohtani is two players. What if one needs to be sent down?

Shohei Ohtani could be two players: a starting pitcher and a designated hitter (DH)/outfielder. His Angels team hopes that Ohtani is both in the starting rotation and their primary DH.

But what if, through either injury or performance, one but not both Ohtanis needs to  be sent down to a minor league team? It could mean that the Angels would lose two starting players. The bad/injured Ohtani could drag the good/healthy Ohtani down with him.

This dynamic has not been addressed. Mostly people have been drinking the Kool-Aid and assuming that Shohei Ohtani is two players but never considering the very real possibility that one Shohei Ohtani would need to play in the minors.