With the Evra stories not going away, Vermaelen only makes sense if we need a player who can potentially be a left sided back 3 player, or fill in at left back of Shaw needs a rest.
Carrick and Herrera could be decent, if Carrick shows last year was just the overall Moyes malaise, rather than a personal decline.
After all, under Fergie we often had what is referred to as a sitter and a runner. Fletcher and Scholes was often used as one example.
Where we didn't do well, was with Carrick and Fletcher/Giggs/Fellaini. None had the sheer mobility to compliment him/