Uncia did some excellent recon work last game about the gap between Greivis working with Cousins, and IT working with Cousins.. You should check it out in the grades thread under IT's grade.
So it is a huge concern, the biggest of the trade. Talewntwise people need to toss the analytics stuff right in the crapper -- this is a no brainer on talent. But the big concern, the HUGE concern, has to be with the sudden arrival of a lot of selfish meness in the starting lineup, and what that means for our dominant center, a position dependent on other guys sacrificing their own little egos...and being tall enough to make a post entry pass. Its the main way this might not work out, and I'm sure Malone is well aware of that fact and must be concocting chucker containment plans even as we speak.
We just put the #1 (Cousins), #5 (Gay) and #10 (Isaiah) usage guys in the entire NBA into one starting lineup. On paper that's insanity, especially while your other starters may be guys like McLemore and Williams, who will want shots as well.
For comparison the two most hierarchial NBA teams at the moment are OKC with Durant (#6USG%) and Westbrook (#2USG%), and Miami with Lebron (#7USG%) and Wade (#12USG%) but look at the rest of their starters. Each has one big getting 14-15ppg crumbs after the main guns get done, and then pure 100% need no shots roleplayers. Our big accepting crumbs would be DeMarcus Cousins, and our need no shots roleplayers would be McLemore and Williams? No, fit matters, and its not a great one without a followup move. if this fails, it fails in a big scrum for the ball with everybody's numbers taking a hit and impact being muted.