Id say let Perk guard Gasol, let KG guard Bynum.
I listened to LA radio yesterday, much concern over Bynum and his knee and how effective he can actually be. If he only at 75%, Id take a chance with KG on him and let Perk push Gasol around and not let him heat up. If worse comes to worse, KG could move over to Gasol.
Estimated Bynum plays between only 12-22 minutes anyway, so he shouldnt be too much of a factor anyway.