Power Flaw

NOTHING YOU DO CAN HELP ME, NEWBIE.

Power Flaws are when a person is too powerful, too powerless, or doesn't have abilities that work anymore. This could do some serious damage to their character and could result in them being Too Broken To Fix. However, there are ways to prevent Canon Bannin', such as by Bussing them or, much more extremely, killing them off.

OP
If Guy has way too much power for his current situation, it's highly advised the creator comes up with a fix, like Guy loses his Helluva Weapon to a Boilin' Lake O' Lava, his Power Medallion is Forever Ded and he can no longer access his power that made him so OP, or, if all else fails, some way to Bus him in a way that doesn't look confusing, awkward, or out of nowhere. And since we aren't going to keep Guy out of the story for good, he might as well get Debussed at some point (most preferably when the writers get it together), this time balanced in power.