Honest question -- What would stop the Brewers from 'floating' an extra roster spot the entire season by rotating Guerra and Woodruff between AAA and MLB, sending them back down after a start, and calling up the other when a 5th spot is needed, since they would always meet the 10 day down requirement by then. I don't see anything within the rules that would stop them, and by my estimate they could float an extra roster spot the entire season except on the days that they actually need a 5th starter. Also, since each one would only be spending about 20ish days on the active MLB roster in the season, could they negotiate to just pay them both their regular MLB salary anyway (since that's going to be a relatively small amount anyway compared to the overall payroll). I'm just honestly curious as to whether this would be legal.