Maybe the truth is somewhere in between... I do think Thibs deserves a lot of credit for creating an identity, a defensive mindset/culture that our players did not have prior... He is loyal, consistent, maximizes effort and promotes hard work/grinding from his players, etc...
And I also think he is sometimes too rigid and overly loyal to specific players. Kind of a my way or the highway type of authority that sometimes doesn't take advantage of some player diversity we have/had had.
I do think he has developed IQ, Grimes and McBride very well. I don't think he puts Toppin in a position to succeed but also suspect that Toppin is not serious enough for Thibs style and respect needed (a personality and/or generational thing perhaps)? Similar with Cam and while it seems true Cam didn't have what it takes - we are again looking for a 6'8 long athletic wing. Makes me wonder what we will seek in a backup PF once Toppin is eventually moved...
I do think he could have tried to better utilize his strengths and showed a somewhat longer leash as that is part of developement. Thibs seems to give a long leash to Randle, RJ, etc... IMO your veteran players need a shorter leash b/c they have gone through what the younger players still need to work through when trying to bring them up to a higher level of dedication, skill development and mental toughness.
I'd give him an B+ with this roster but do wish that Thibs or Randle moves on at some point because that combination does not seem like a good one IMO.
I watch Spoelstra and see him as similar but with a more creative approach and flexibility to pivot as he coaches at times. I think Spol is the best coach in the league at the moment.