Valdez and Pablo are not exactly desirable trade fodder. They're stopgap solutions filling in for injuries. Valdez shelf-life is directly linked to the return of Grissom, who likely plays second base the bulk of the time, but we shall see if he is not given the occasion/frequent outing at SS.
Rafaela is the clear best SS on this team, and probably the best one between Boston and Portland. But since Portland is not supplying a solution anytime soon, I could see him taking SS this year. But Cora has overtly stated his future is in CF, so his play at SS is up in the air right now unfortunately. Especially given that Cora has shown he is fine with giving a long leash to weak defensive shortstops. Add to that O'Neill is out right now, leaving the Sox with only 3 outfielders on the roster, assuming they do not put Yoshida out there. So until O'Neill returns, expect Rafaela in CF. This means the Sox infield is left with juggling Reyes, Valdez and Hamilton because right now, they are all healthy...