That's a whole lot of IFs there at the beginning of your post. 10 years of Tulo in the majors and not once playing a full season is pretty good evidence he isn't able to stay healthy. He's definitely a very good defensive SS, but his offensive numbers are helped by the fact he plays in Colorado for half the season. If you look at the last three year from 2012 to 2014: Home: BA .354, HR 31, Runs 107, RBI 92 Away: BA .276, HR 23, Runs 69, RBI 69 Also, I don't think I'd call someone who will be 31 in the beginning of October "in the middle of their prime." Prime age is 26 to 30 and once you get to 30 you're on the back end of your prime.