Btw, I've been thinking about this for a while and now I've realized when watching Cole's battle again.
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He describes that he has not a fully formed brain to receive information from his eyes. But he can still think, he has not any type of incongruence in his speaking (or thinking). I know this is maybe just in-game mechanics and there has to be a way to describe what is happening, but that gave me an idea for an ability awakened by lv4.
In lv1, Mc's brain explodes and it's game over. In lv2, he can withstand being cut in many pieces, his brain possibly being scrambled in the process, and regenerate back. In lv3, his body can quite literally disintegrate until only his spine remains, and he'll be able to heal back unless his spine is destroyed. What if for lv4, he doesn't need to protect his spine anymore to remain alive? That his conscience is shared through all, and I mean ALL his body, making his brain- although obviously useful, no longer needed.
For example, mind-control business would be piece of cake now that he doesn't need his brain to perform actions, if some try to mind-fuck him he could just melt his brain away. Also, I've been thinking about his forms too. When he evolved to his third, he got three main forms. Speed, Tank, and Memory. What if fourth gives him a more compact and concept-related form, such as "Body" form offering the highest of Attack, speed and defense, and a further developed "Memory" form that focus 100% now in his Memory trait. That could be cool.