AndyAndresBU

Overrated stat is probably Wins for pitchers, fielding percentage for fielders, and RBI for hitters. But YMMV (old school internet-ese for Your Milage May Vary!)!

This is the Holy Grail question that all team are trying to address in various degrees.

Your idea bumps into "clubhouse chemistry," and how groups in any endeavour (business, academics, etc.) perform best or better. This is a real important area of research and therefore should improve baseball performance.

But is difficult research to do, not-at-all low hanging fruit.

I would say the Twins are the least likely to win the WS. But I could be wrong!

Very well. By various metrics the Indians, Red Sox, Yankees, Astros, Angels and Dodgers have had the best bullpens in baseball (one of these things is not like the others -- hah).

So I like the Astros bullpen a lot! They will be just fine in the playoffs!

Probably projected OBP (better yet, OPS) in descending order -- but even the most optimal lineup does not get you too many extra wins. Bill James work in his Manager's Book has a great argument/analysis on this topic.