1. Nice Seinfeld reference.
2. Plenty of teams have won titles with mediocre to bad 1b. Are you saying corner OF is easier? We saw Hanley Ramirez try both positions and was much better at 1b. RF especially is not easier than 1b, considering the throws involved. Saying "all you have to do is hit the cutoff man" is a massive understatement. Plenty of times, outfielders throw directly to bases, including home, and for a RF, the throw to third base is a particularly tough one. There is a reason Betts throw to third was a highlight. And while the plays might be infrequent, tracking down and catching a flyball that is over an outfielder's head is never an easy play, despite how Bradley and Betts make it look. And when those plays dont happen, it is a bad, bad thing all around.
There is a reason most inferior fielders get moved to 1b. Taking throws is simply easier than fielding batted balls. The first baseman takes a lot of throws. Everyone else has the overwhelming majority of their plays fielding batted balls. (Note: "Easiest" doesn't always mean "easy.")
REally, I would challenge you to name a good team that was made great by a good first baseman's glove. Hernandez won his first title with Ozzie Smith anchoring the infield. While I think Smith was an overrated defensive shortstop, that doesn't change the fact that he was still an outstanding defender (I just don't think he was the best ever at his position, and that he was inferior to Omar Vizquel) and his impact defensively was much greater than that of Hernandez...