Would be a mediocre team. A ton of athleticism and maximum rim protection, they would be a monstrous defensive squad, but you are going to eliminate all of that perimeter shooting? Duncan is maybe the best 3pt shooter in the NBA. Herro was also a great shooter as a rookie. Butler showed himself to be an elite player when he is rested and motivated, so him and Giannis alone would make the Heat interesting, but Bam, Butler and Giannis with some trail mix isnt enough to be a real contender IMO.
And yea Kyrie won a title and hit that big time shot, but he was a drag in Boston. He acted like a little bitch and was basically a liability towards the end. Its sad that IT fucked up his hip, if he would have stayed healthy and signed a big contract with Boston, who knows where that team would be. If he would have kept up his All Star level play, and continued pouring in 30 pts a game damn near, they would have never signed Kyrie and could have had even more talent to go along with Tatum and Brown. (wouldnt have had to pay Kemba and probably wouldnt have signed Horford either) A healthy Thomas, Tatum, Brown and with the money they would have saved they could of gotten another major piece.
And Thompson is on the verge of being washed up. He maybe has 1 more solid season in him, he is one of those players that just fall off the face of the Earth once the arrow starts pointing in the wrong direction. Hell either have injury problems or get more and more out of shape and constantly be in foul trouble. Celtics might be a worse team this year than last tbh.