So Mc's lack of magic is solely to cause ever more misunderstandings since any critical plot development can be delivered via magical means and he will neither see nor hear a single thing and EVERYONE else in the universe will with utmost, unshakable conviction believe that he Long since planned the whole thing down to where every atom in the universe will be positioned and at what time so as to fulfill his Super Ultra Mega God tier Machiavellian schemes and master crafted plans that were all planed out and put in place eons ago before any one of them was born, before even the stars and cosmos was born he was setting these plans. And if he tells them that he didn't than it is clearly him testing them with their life on the line.