Yeah, I really don't know what you're talking about in regards to the Astros, but it seems what you're trying to do is say the 13-win improvement from 2014 to 2015 shouldn't count towards Molitor's "net win" tally. Sorry, but you can't reasonably do that. If you insist on using "net wins" as a way to measure a manager's abilities, the correct number (as old nurse pointed out) is +15.