Probally a little of both . Using MJ as an excuse for not taking charges . Thats lame. But, he probally is just more worried about potential injuries. Its a head thing. Kobe is not as wreckless with his body as some greats have been.
But, I have ALWAYS thought .... Kobe is selfish player , in that , he seems to always be going half speed on Defense in order to save "ALL" his energy for scoring. Kinds sucks to be his teammates I would think.
He gets his share or steals , but that again is a way to get another score for his effort .
Kobe is not a good team player , he'll throw 100% energy into winning as long as its taking or getting shots for his team.
I'm more impressed with wellrounded players than one trick shooters ( MELLO, KOBE)
MJ might have not taken alot of charges , but he played defense 1000X better than Kobe.