Right now, I say Jaylen for the C's since he's averaging 25 PPG and has had a 40-point effort. Only the 2nd guy with 40+ points this series (the other being Butler in Game 1).
Miami, it's hard to say. Tbh I don't think any one player has had more than 1 good game lol. Butler Game 1, Bam Game 3, and then besides that a lot of mediocre performances collectively. I think I'd still lean Butler. The stats obviously won't reflect it but Oladipo I think could have a case with how he's played since the start of Game 3.
EDIT: Actually, maybe Bam still has a case. He had 18/10 yesterday, and he's averaging 15/8 for the series