So Harden ended up costing - 4 first rounders + 4 swaps + Levert + (some bad contracts) ~~ 6 first round picks
Danny had 6 first round picks in 19 and 20 and nothing worth bragging to show for while Brooklyn has Harden.
To all that are saying Harden would cost Brown - how come Harden didn't cost Durant or Irving? I think Danny's priorities are off. He will always be afraid to trade picks the way Brooklyn did.
Brown or Walker had to go out for salary purposes and obviously Houston would have no interest in Walker. But to your point, if Boston could have found a landing spot for Walker and was willing to trade all those 1st rounders, then I do think they might have been able to keep Brown.
So let's just say it was the Knicks taking Walker
Knicks - Walker
Boston - Harden, Burks, Bullock
Houston - Ntkilina, Payton, Nesmith, Langford, G. Williams, 1st's - 21, 23, 25, 27 - Swaps - 22, 24, 26
I think that package is at least similar to what the Rockets ended up with.
So Boston post-trade would have been (with 1 roster spot open)
Starters - Harden, Brown, Tatum, Theis, Thompson
Playoff Rotation - Smart, Burks, R. Williams
Regular Season Rotation - Pritchard, Teague, Bullock, Ojeleye
Deep Bench - Edwards, Green, Waters, Fall
Now obviously to give up that many future picks you'd have to have buy-in from Harden, but I think that is something that could have worked and that team is clearly the best the team in the East if not all of basketball over the next couple of seasons.