Saints 2013 Draft
It really depends on what Ryan asks Vaccaro to do. If he plans on putting him at FS in cover-1, I think that Vaccaro will not play very well. If he plans on playing him manned up against TEs at SS, I believe that he could be good.
That's not to say that Vaccaro couldn't play cover-1 down the road...but right now they should put him in a position to succeed and slowly increase his responsibilities.
But the Saints still need a FS capable of cover-1 either way...unless IAQ is that guy. Jenkins is definitely NOT that guy.