In general, I think this is the starting unit.
But for the Lakers, undermanned with only Pau down low, Favors has to start. We have to neutralize (as much as possible) their best scoring threat. And since their wings are Kobe (hurt or not) and Metta/Barnes, we just can't start Bell. So Ty has to match up in this game. That said, I'm sure we'll see Bell on Kobe which makes no sense.