I'll assume you were referring your questions to me, but if I'm wrong, so be it...
Rather than an All-Star team, here's what I think would be the best NBA team that could be assembled in heaven where everyone is at their best forever:
Center: Bill Russell
Power Forward: Elgin Baylor
Small Forward: Larry Bird
Shooting Guard: Michael Jordan
Point Guard: Oscar Robertson
Off the Bench: Kareem Abdul-Jabbar, Magic Johnson, Rick Barry
I guess some explanation is now in order since almost everyone else picks Magic for their starting team and almost nobody picks Russell. Scoring is not an issue on this team, therefore I picked the best defensive center ever, and he could score as well. When it comes down to it for an offensive center on a team like this, I'd rather have Abdul-Jabbar than Chamberlain, but that's a personal preference. Shaq doesn't merit consideration yet, being the best today isn't as impressive to me. Oscar Robertson averaged a triple double one season before such stats were considered important -- absolutely amazing. Again scoring isn't as important for this team, and Magic took a while to develop a reliable outside shot, and Magic had more talent around him than anybody else, so I'll take Oscar's skills over Magic's. Oh, and Oscar played before everyone was allowed to palm the ball and take three (or four) steps to the basket. Imagine what Oscar could have done today. If I can swap players around, I'd start Magic in the power forward slot over Elgin Baylor, though. Baylor is only marginally better than a lot of power forward who could be picked, some of whom are still playing, but I'd still take Magic over all them if given the chance. Since Magic can play center or point guard, he can surely play power forward. Larry Bird was the epitome of the point forward, he could shoot as well as anybody and he was an excellent passer. For shooting guard, who doesn't want to be like Mike? Off the bench, there's one at each position. Barry allows the team to go to what could essentially be a 4 guard offense to finish a team off with a whole bunch of high percentage free throw shooters to receive the inbounds pass from Russell. Yet another advantage to thinking of Magic as a forward. One of the most interesting aspects of this team is that I don't think there would a problem with not enough shots to go around, unlike most all-star teams.
As to baseball, perhaps the Rocket is the best in a long time. I'm looking forward to Bill James next book to help answer that question. As Mr. James has noted, we have to distinguish between what he calls peak value and career value. They usually produce different answers. For peak value, one could make an argument that Bruce Sutter was one of the most dominant pitchers ever for a few years. It's real hard to compare across eras, but Roger's only serious competition would seem to be Gibson, Seaver, Koufax, and Jenkins (won 20 games a year when the Cubs were not that good year after year). I'm partial to Fergie, but he seems to merit a lot more credit than he usually gets since his strikeout totals weren't as high as the others. The only guy who might be in that class today other than Roger might be Greg Maddox. If Kerry Wood can stay healthy, is he the next Nolan Ryan?