He definitely has gotten stronger, not in pure strength though, more like in combat ability, invisible providence, beatrice, parkour, whip, cor leonis, etc
He is still not very strong, but he has become more useful in battle, definitely
Not much in strength, but his understanding and knowledge has definitely come a long way from Arc 1, and he worked hard to build the trust and friendship of the characters, so, I suppose he has gotten stronger in a way