I'm surprised you have such a bearish outlook on OKC. I think they're in a really good spot right now. I don't know why you'd think they'd trade SGA as a 25 year old and restart a rebuild right in the middle of a rebuild. Team surprised everyone and won a play in game on the back of SGA and a bunch of young promising players who are only going to get better.
You're comparing Vlade whiffing on nearly every single draft pick with a team who so far has hit on nearly all of theirs. This team is going to be a problem this year and they're only going to get better as time goes on.
The thing is... they have players, not a team. Almost everyone on that team is a slasher who gets to the line but doesn't hit reliably from 3pt range yet. What typically happens with teams structured this way is that they all fight for playing time and then they all need new contracts and start leaving one by one. Sam Presti hit on almost all of his picks when the Thunder first moved to OKC too and they ended up trading all of them. Kevin Durant was a once in a generation can't miss superstar prospect and in his 9 year run there they got to the Finals once. They could have won it all but the owner balked when it came time to pay everybody.
If Chet becomes a superstar things might be different for them this time but none of the top ranked big guys have done anything in two decades. They're either injured off and on or they end up forcing their teams to play an inefficient style of basketball which doesn't win anymore. Also OKC has been notorious for their lack of patience. They're the exact opposite of Portland which clung to Brandon Roy and now Damian Lillard long after it was clear to everyone else that their run was over. OKC keeps trading and tinkering and drafting and going nowhere.
I just don't see them as much of a threat. I don't see how SGA could play better than he did this past season and he couldn't get them past the play-in. Granted folks said similar things about De'Aaron Fox a year ago but look what it took to turn things around for him -- the additions of Malik Monk, Kevin Huerter, Keegan Murray, Domantas Sabonis, and Mike Brown. That's a Coach of the Year, a top rookie, a sharp shooter, an All Star big man, and a 6th man of the year candidate.