Okay, so maybe trading the #6 pick (Martell Webster) and #27 pick (Linas Kleiza) in the 2005 draft to Portland for the #3 pick (DWill) was a fleece of a trade. I see your point there.
I didn't say it wasn't a solid trade, because it was a solid trade. But you can't make a "but this became that" argument without acknowledging that we got Deron for nothing, and TRADING AWAY DERON CAN'T HAPPEN WITHOUT HAVING DERON.
I'd have to list DWill twice. Getting him in originally was a KOC gem. There was an acknowledged drop-off after DWill/Paul in draft talent. Jazz seemed to be positioned perfectly to get their choice of PG's...until they were jumped twice in the lottery. Being able to trade up was pivotal. Otherwise, the next best PG prospect was Felton. Absolute thievery of Portland, especially since Utah got who they had promised to select at #27 in the 2nd round anyway, CJ Miles - evidenced by Miller giving him a guaranteed deal and the equivalent money of a 1st round pick.
As for getting Favors and other assets, including Harris, it was a huge win. It was reported the Jazz tried to get a verbal promise out of Williams and his agent in multiple meetings that he'd sign for the max. Reportedly, he/his agent said he wanted to become a FA. Nothing was stated that he'd 100% leave, but there was no commitment to stay, either. Jazz did great in that trade. It was DL's bungling of picks and free agency, and the Sloan debacle, that then was unable to build on the team afterwards and resulted in an eventual rebuild.
IIRC, Williams was battling a sore wrist at the time of the trade, although he passed a physical. Jazz had hit a rough patch of games right before Sloan re-signed. And if you believe it or not, his resignation, at least in part, was reportedly due to him losing control of his PG and not having the support of management to discipline Williams. I doubt Deron would have stayed. And in hindsight, even had he remained healthy, the team was going nowhere under Ty.
So two big wins with Deron's name on them, IMO. First to draft him, second to get rid of him.