Thanks for chap
So wait if the TA changes his future here, won't it prove the theory wrong that mc was needed for the changes?
on a technicality it can be argued MC is needed as he did facilitate a favorable situation (can't imagine many people would be okay even mentioning the idea of the forbidden magics let alone teaching the procedure to one)
its possible it could change w/o MC, but it'd more likely be too late to find, vet, and insert a new "teacher" whose job is to care about the students and able to deal with their individual quirks. At the very least MC has already established 2+ weeks of some familiarity with the students, it could lead to an unknown setback/shallow relations if the teacher were suddenly replaced again