I don't think platooning Bush is practical, nor do I think I'd want to even if it was practical. There's just no good reason to expect a larger than average home/away split from Bush. If anything, I'd think a flyball-happy pitcher like Bush would be expected to do worse at home. I'm tempted to think it's mostly just a fluky split. You'll find a million fluky splits if you look for them. It's almost impossible to say which ones are "real". Quality start is a very 'meh' stat - isn't it 6 IP, and giving up 3 or fewer runs? That's a 4.5 ERA and consistently needing the pen to get 9 more outs. That's more average than anything. What's so bad about being average? It makes you better than 50% of the starting pitchers in the league. I have no problem calling that a "quality" start, although we are really just arguing semantics. Quality can man a million things to a million people. Pitchers made 4,862 starts last year and 2,318 resulted in a quality start. That's about 48%. If your backend of the rotation is making quality starts more often than not, you are in very good shape. I would really like to see the 'quality start' term get pushed to describing only starts 7 innings or more with 3 or fewer earned runs given up. Then it would actually mean what it implies. A little less than 25% of NL starts last year resulted in that kind of "quality" start, so it certainly would set the bar higher. I'm not sure how particularly fair it would be to the backend of the rotation in the NL to focus on 7 innings, though. Even a mediocre NL pitcher doing well isn't going to get a chance to go 7 innings fairly often.