Not exactly how to structure this post in a cohesive way, but I've got a few main points I want to address and they might intertwine.
1. First of all, Kemba definitely didn't have much help overall in his time in Charlotte. Al Jefferson was not a great winning basketball player and Dwight was on his way down in his career. Batum was a highly regarded player coming in though who never panned out, so that is a curious case.
2. So Batum didn't flourish when he went there. Charlotte also had a number of reasonable lottery picks this decade. I have a theory on NBA draft picks that its not entirely about prospects being booms/busts themselves (although of course there are certainly exceptions), but rather if the franchise booms/busts in their development of the prospects. Were all their top draft picks over the years -- MKG, Gerald Henderson, Kaminsky, Zeller -- just complete busts of NBA basketball players or did they never develop in part because of Kemba's playing style? Or Charlotte's player development? Is that also why Batum never flourished there? Was there ever ONE player who flourished playing alongside Kemba? Was the surrounding cast *that* bad... was Charlotte management was so incompetent they couldn't even get lucky enough to somehow stumble upon ONE good basketball player to put on the floor with Kemba in the past 8 seasons?
3. I don't think Marvin Williams and Nic Batum going 1-3 and 0-4 from the floor in that Philly game are indicative of being bad players. I think its indicative of a point guard not getting them involved in the game. At least for me... if I'm only taking 3 shots in 27 minutes, that is likely affecting my defensive effort as well. I know that's not a ringing endorsement of me, but there's a human element to that which can't be ignored.
I have hope to believe that Kemba will be a better fit here than Kyrie was. I'm hopeful that he has trust in his teammates here and I think there was some reason to not have faith in his surrounding cast and management in Charlotte. But I'm a little skeptical too that no other players seemed to get better when coming to Charlotte and playing alongside Kemba. I genuinely have optimism that he will work out well in Boston's system, but I do carry a little bit of doubt that maybe Kemba's not exactly what we all hope/think he is.