No one is stating that the rookie of the year is always the best player from the draft. Tyreke is an outlier and an exception, not the norm. For every "Look at Tyreke" point you make, someone can counter that with "Look at Simmons, Towns, Lillard, Irving, Griffin, Durant, Paul, LBJ" etc etc. There's like 4 or 5 really great ROYs for every 1 that didn't turn out all that great. Normally when a player is good as a rookie, they're even better as a vet. Most players don't start out on top and slowly get worse the way Tyreke did for a while.
Luka fans are naturally going to be mad at the front office for not picking him. It's the natural trajectory of the conversation if you wanted Luka in this draft. I don't see why there anyone should be surprised by that.
I don't think our FO should be fired either (except Brandon Williams) but I think they made a mistake with the pick. I don't think they whiffed on the best player and drafted a bust but I think they made a mistake and didn't draft the player that I think will win more games in the future and I'm not basing that off of their rookie year comparisons. I've held that belief since before either one of them stepped onto an NBA court.