For sure nobody has 10 random friends that want to join on the same thing, at the same time, on the same forum with the same wallet.

They are obvious alts.

The question is for the others accounts, they are now used on relevant signatures and if I will tag them all they he probably will be kicked out.

So even if maybe has no cheated with the very high-rank accounts... (I'm still looking at the history of these accounts) does he deserve a tag on every account?