Another cheater in fleet arena

I think you're going to have a hard time getting traction on a cheating accusation when your evidence amounts to "A sub 7* fleet is beating other sub 7* fleets".

Also, from the rules posted here under "Don'ts":

● Report A Potential Cheater: If you want to report a potential cheater, please send a message to @CG_Leviathan with details on why you think someone is cheating and your ally code plus the ally code and name of the suspected cheater.

and this:

● Don't "name and shame." If you see a suspected cheater, please report them by using the appropriate tools. We can't take any action against such accounts on the forums, and such posts can lead to harassment.

Good luck - if this person is in fact cheating I hope they get what's coming to them.