I was mostly replying to IrrDudes original post about Teix, Encarnacion, Bautista, and Ramirez but was also at work and missed the other posts. He posted 4 guys and had a response about Mervis being 25, but two of them didn't really succeed until they were 29 and in Toronto.
Frankly, if Mervis puts up Edwin's line of .260/.336/.453 (with 24 hr and 81 rbi per 162 gp because those certainly are stats) from his pre-29 years, I'd consider that a huge success. Especially in todays game where last year Josh Bell put up a similar line (although split between being good in WAS and ass in SD) and had an OPS+ of 128.