Originally Posted by
Sutekh
They could go with a sort of retcon that he'd been using his elasticity powers to increase the folds in his brain tissue or something silly, and that the net effect was driving him crazy (or, to be less dramatic, simply making it take longer and longer for him to process information, since he had not only dramatically increased his storage and processing power, but also, by increasing the surface area, made it take longer and longer to simply think, or to retrieve information, as he would increasingly 'get lost in his own mind'). So he'd have to 'wipe the slate clean,' after downloading as much information as he could to external storage, and be 'powered down' intellectually to 'mere' genius/super-genius levels like Stark, Pym, etc.
That said, it seems like a lot of Marvel geniuses could be cheating. Stark's infused his body with nanotech that's connected to his brain cybernetically. Pym's demonstrably able to access bio-matter from another dimension, and increase or decease the mass of his brain without altering his brainpower (if he's as smart at bug size, with a brain the size of a pinhead, as he is at full size, then he's clearly still able to access the 99% of his brain that's in off in Pym Particle-land/Kosmos, and since he's also not apparently any smarter at sixty feet tall, with a brain that Reed Richards could go swimming in, then it stands to reason that all of that big brain is available to him even at human size, and he's totally cheating...). Doom's got a dozen Doombots at any given time that could be parallel processing his thinky-meats.