I think Carey vs kessler is kinda apples to oranges.
Was Carey a rookie of the year candidate? Has he ever had a year in the nba as good as kessler did last year? Can you post an example of a big whose game is like Gobert, Kessler, deandre jordan, jarrett allen, etc who started shooting 3 pointers and ruined their career? If so, then that would be a good example of your concern for Kessler working on his outside shot. Im doubting that you can provide an example though. I cant think of anyone.
Maybe Carey is shooting threes because his current skillset has got him nowhere in the nba so far. idk I assume coaches and agents and whatnot also give these guys specific things to work on.
Like i dont think Kessler is working on his outside game against his coaches wishes. Quite the opposite in fact. Kessler seems pretty coachable. I bet despite what hardy said in the past that Hardy is encouraging kessler to try to expand his game.