I understand what you are doing here but I probably differ in a couple ways. First, when I think best team, I think best TEAM to win something, moreso than accumulated best stat years -- especially when dealing with players on lousy teams that stuff stats -- namely points. As such I can't imagine putting Dana Barros on a Sixers team over Cheeks. Being a fourth or fifth option, but reliably hitting a clutch shot is immensely important. Plus ball distribution etc.
I also have a problem putting Simmons on a team like this. Again, I don't care about season stats as much as the ability to excel in the playoffs. Until Ben has a role in the playoffs that goes beyong bring the ball up to half court, hand off to Butler (or whomever) and then go hide in the corner -- way, way in the corner so we don't have to plat 4 on 5, he doesn't get any ranking from me. Give me Andrew Toney from 81-83. Some of his games against the Lakers and Celtics were simply awesome -- and against superior competition. He literally was unstoppable in some of those games, and his season stats (using what I believe is your criterion) were right up there with the guards you list. Plus, his defensive role in interrupting the Lakers Showtime in 83 was as good a defensive exhibition as I can ever remember a Sixer having in a big series. He was like a cruise missile targeting Magic at half court every time Magic got the ball. Magic gets the outlet, Andrew swooshes in to intercept 5 feet before half court -- bang, no fast break.
Anyway, lastly, every championship team needs a lockdown corner, so I'd probably find a way to get Bobby Jones on the team too -- over Webber, I suppose. But I understand. With the exception of Toney, our approach was different.
Also, I think your Cunningham rebound stats are wrong.