Are Strontians weak to a specific wave of radiation? I know they're basically purple Kryptonians, but do they have a Kryptonite?

I thought Gladiator's main weakness was that his strength comes from his confidence so if you can get him to doubt himself he's screwed.

And we don't really know which Avengers Kid Gladiator is actually fighting. It might just be the three who are coming to the school (She-Hulk, Falcon and Moon Knight)