I'm going to make a prediction here: if Bannister continues to walk more hitters than he strikes out, his ERA will be up a full 2 runs by the end of the year. It's one thing to not have phenomenal tools and excel anyway. It's quite another not to have phenomenal tools but continue to put runners on base and balls in play. If you're not striking hitters out, baseballs are being put in play, and if runners are on base, that means runners are often advancing.
I see your point; Bannister can excel in spite of limited tools, and I agree with that. But I don't agree with the proposition that he has a mythical ability to pitch out of a jam every time out. History has told us a different story time and again. Like I said, there's only one Kirk Reuter. So far, Bannister's been lucky, not good. And to keep his ERA around 3, he's going to have to strike out more hitters and walk less.