Chop,
I think you are vastly over rating Cousins. He can put up big numbers on terrible teams. That is all he has proven so far. He's been in the league a while now, if he was a great player or even a top 25 player in the league this team wouldn't be a bottom dweller ever year with him as the main guy. You stick a superstar and a horrible team that team will improve 15 wins. Boogie isn't that kind of player.
He does a lot of things that make him look like a special player, good handle, good shot, good post game but he does nothing great. Not a terrific defender either. The Pelicans were looking at Okafor too, he could average 20 and 9 if he was the focal point for a bad team too. Despite those numbers he is at best a marginal player because he defense stinks so he gives up more then gets.
Hard to classify this as a steal for anyone yet. They were shopping him for a long time and this is the best they could get. Cousins is due for free agency and even marginal players get $100mil nowadays, so Cousins will get $200mil based on his numbers. At 200 mil I'm sure half the league wouldn't trade a rack of basketball for Cousins if they knew they would have to resign him, maybe they would give up a little for him as a rental.
Thats before you even get to his emotional problems. Thats a side I won't even get into.
This guy will never be a star on a contending team, maybe as a roll player. Which this trade is probably good for him. He's proven he can't lead a team or even make a team average on his own. They need Davis to be the superstar then a guard to be the star, maybe Boogie as a role player. If you think they are gonna be championship contenders with him as the second best player your nuts. He may be the best center numbers wise, but every single team in the league would take Townes or Embiid over him, and probably a few other players too.