I cannot answer your question but there is an independent leaguer who was coached by a poster of this forum (hasn't been active the last months though- his name is tewks) who now plays AA ball for the twins. his name is chris collabello. this year was his first season and he did well driving in 98.
still his chances to make the show are really small but still remarkable to make it straight to AA ball after not being drafted and playing indy ball till the late 20s.
I think walks are overrated unless you can run. If you get a walk and put the pitcher in a stretch, that helps, but the guy who walks and can’t run, most of the time he’s clogging up the bases for somebody who can run. – Dusty Baker.