I think it's more a case of do we have players in the squad up to coming in for either of them when they;re injured.
In Gerrard's case, Yossi is increasingly showing both his quality and suitability for the "hole" role, whilst Aquilani might well prove another able deputy.
In Torres' case, we've no-one in the squad within a whisker of his ability.
So, at the moment we are much weaker without Torres.