Other than that, MC is MC and his magic is actually decently strong. He just doesn't want to show it.
But having that ace means he can negotiate from a position of strength, so despite looking easy to push around, that's only for his relatives.
He could, if he would. It doesn't seem overly likely, though, as he's not in a habit of cracking skulls whenever someone crosses him. And because of that, people who don't intimately know him would underestimate him. If he, as an adult in the future, was placed in charge of some office or site, unscrupulous people could easily deem he's soft. They could do things they shouldn't do, certain that Alfred won't make a big deal out of it. However, if Alfred had a scarier reputation, they wouldn't dare to.
This was my point, not so much what he's actually capable of. Nobody can even imagine his true power. But then again, he's not that old yet. Technically he should always have some people around him who would make sure nobody disrespects him too much. That would be the last thing he'd want.