Yeah. I agree with that. This will give him a few more tools for his arsenal, but still sounds pretty limited. So most fights will probably still be him using his guts, wits, and a few limited tools. So it will open up more story options, but he'll still have a handicap to overcome, which makes him awesome.
I also agree giving him regular magic would kill it, but I think the Manga writer knows that too, probably why he did the time travel thing.