Y'know, this kinda shows the dangers of the MCs skill, a crutch so good that the people being unknowingly protected would never gain proper combat experience due to basically being on easy mode and then turning into half-useless scrubs without true knowledge about their own capabilities later on if the mc ever left their party.
I'd certainly not want to party with him for too long in this setting, maybe once in a while but only when REALLY needed.