Unless of course your Glock will not fire because, in the course of pushing the muzzle up into the fat guy's torso, you've shoved the slide out of battery. The point here is that no one platform is the best for every possible situation. I find myself much more likely to have to fight one very large individual than a gang, so a revolver is the best choice for me (particularly one in .357 or .44 Magnum). You, on the other hand, may be more likely to be accosted by a gang than a single large person so you may be better served by a semi-auto.
the revolver could be jammed as far as up his stomach as you want, that's true, unless of course the fat guy puts his finger behind the trigger inside your trigger guard
i'd never jam a pistol into someone's side, i don't want him touching it at all...
the point behind my argument is that you're more likely to encounter no threat at all, therefore if you're going to plan for the 'most likely' scenario, you should leave your pistol in the safe
if you're not going to leave your pistol in the safe, then you're planning for a 'less likely' situation, and it makes no logical sense to say 'i should plan for this bad scenario but i don't care to plan for this even worse scenario'