I am not sure that the core premise is correct; that we could have gotten Harden if we were willing to give up Brown. That may be true, but I don't see it as a statement of fact.
To recap, Houston got the following:
Victor Oladipo (from Pacers), Dante Exum (from Cavs), Rodions Kurucs (from Nets) plus Brooklyn's three unprotected first-round draft picks -- 2022, 2024 and 2026 -- in the deal, plus pick swaps in 2021, 2023, 2025 and 2027. Also, Milwaukee's 2022 first-round pick, via Cleveland.
Houston didn't even want LeVert and Allen, two pretty promising young players, they clearly favored expiring contracts that could be flipped and picks. I guess there could have been a deal there that involved Brown but I am not sure it is as binary as assuming there was a deal on the table for Brown and all our picks and other picks acquired from other teams and Danny said no.
Danny was willing to offer Tatum in a deal for Davis (or so the reporting was). But now it is being assumed as fact that Danny was not willing to give up Brown for Harden? That it was a done deal except for Danny? My understanding is that Danny said the price was too high in general. "Reports" were that Houston asked for Brown + Smart plus who knows how many picks (assuming 3 firsts would be reasonable).
I am sure the debate will rage on for years to come, the "what if" discussions as well. Harden is really good, generational. But this isn't just a Brown for Harden discussion.
He [Danny Ainge] went on to say that the price for Harden was too high, essentially confirming many sources and fans’ opinions on the situation. Later on, it was reported that the asking price from Houston was Jaylen Brown, Marcus Smart, and draft compensation.