Espinal actually looks like he might turn into a big leaguer, assuming he can cover all the infield positions competently. Maybe can carve out a Maicer Izturis (the good version) type of career? Jays weren't going to get better than that for Pearce. The league spits on first basemen nowadays.
As far as Pearce he really is a good player. Just didn't show it in Toronto, and was miscast as an outfielder. Glad to see him succeeding, but definitely don't like that it helps Boston.