Brokeleg Benny has a twin.

[Astegard]

Brokeleg Benny, the gladiator, has a twin.
It seems there are two versions of him in rotation.
And sometimes they both spawn.

[Howlando]

Maybe he's just quicker at moving from one arena to the other than you are.

(Seriously, while I understand it strains creduility a bit, why is this such a big deal? I think it's cool that some NPCs visit both arenas sometimes and while an unfortunate side effect of that is that sometimes they will spawn at both is it really such a big problem?)

[Astegard]

No I think there are literally two versions of him in rotation.
There were 2 of him in the same place and they are counted as different gladiators as you can fight both for 2x the XP reward.
I also think they are slightly different mechanically

[Astegard]

Both versions of him together at the same time, not a big issue but stil bloth are treated as different NPC for duelling purpouses:
https://imgur.com/DyWa0mr