If all 5 are on court, there is no where to hide a weak defender. How effective is Irving going to be when he's having to chase Redick through screens all game?
It certainly going to be a problem but same holds for the sixers....Where are they going to hide JJ on defense? KI will have a party and Smart will keep posting him until long after the game
Also, the Sixers still don't have an answer for Kyrie IMHO. And without a shot Simmons remains a liability on offense especially late in games. That makes a big difference.
Kyrie was always going to be a problem for the Sixers. The trade at least means they'll be able to take advantage of Irving's defense and if he has to expend a lot of energy on defense that may hamper his offense. With Embiid, Redick, Butler and Harris on the court, Simmons shooting issue will be a lot harder to take advantage of.