Guys like Whiteside or Cousins or Howard break our defensive scheme. Any old school post only center will. They also impact team culture, which, if anyone is paying attention, seems to matter some these days.
There is no point in using the TPE for a band-aid. If you can't imagine one of these guys helping win a championship, then why bother? Yes, they might get us a couple of extra wins in the regular season, but they don't get us anywhere in the playoffs. We have the same defense as we had second half of last year, or we don't win the title. Its that simple.
There will be some crazy stuff going down at some point. If we can walk away with an Adebayo (probably the best conceivable guy in the league) or Capela or any other very good to great two way player that can play our defensive scheme, then I'm guessing Stevens will go all in. I doubt we will know about what is available until it happens. What seems available now isn't worth the trouble.