The stats say pat and bazz have been garbage lately,and I bet Baldwin could match, if not exceed their crummy shooting as of late. He's also someone that can attack the rim (which the 2nd unit doesnt do, they settle for tough jumpshots), and moves the ball (the 2nd unit is stagnant).
Plus, he's a better defender than Shabazz on tools alone. The playoffs are more physical that the regular season, which plays in Wade's favor.
Is "not knowing what we have" better than knowing we'll likely get poor play out of our 2nd string backcourt?