KP is a nice player but he is slow and not very athletic. IMO you don't trade a talent that could be a superstar for a guy that hopes to make some all star games.
The man is 7'3, and his athleticism is impressive for his size. He posted a 38" vertical at his draft combine.
He's only 21, and he averaged 18 ppg, 7 rpg and 2 bpg on a bad team as a second option with no talented passers on the roster. He's an excellent shooter and is as good on defense as he is on offense.
Talented big men are different value propositions than 6'4 guards.
As I've said earlier, we have to give up on competing for a title for the next 5 years unless we can find a way to beat GS. We can hope to put together skill guys better than Durant, Curry and Thompson, or we can try to exploit the one weakness they have, which is that they play long stretches with a 6'7 center.
Given our cap situation, we either sign Griffin, or find someone on a cost controlled contract that is talented enough to dominate Draymond Green. We can't sign Hayward, then go out and trade for another $30M player.
The players in the league who fit the profile are
Karl Anthony Towns
Kristaps Porzingis
Joel Embiid
Giannis Antetokounmpo
Nicola Jokic (maybe)
If you want to pursue some tortured trade, you could try to get Anthony Davis or DeMarcus Cousins. Good luck with that.
Porzingis allows us to compete now, and later.
Or we can load up on talent and wait 4-5 years.