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The point is to not get him killed right away. By the way, regarding the Barbarian, I don't remember exactly, but isn't it true that only, um... Barbarians can recruit him in a castle?
No, he's not in the Chaos castle, I think. But the point is that it's not just about the Chaos castle. Sometimes it's mentioned that having a Thief is also a good idea.
I played against a human opponent on an XL map. He bought a Thief((( He wasn't playing as Chaos, and he leveled up his Thief better than his main hero with all that running around. He leveled up a lot))))) When the Thief reached him, he just surrendered))) He was quite the killer)))
And what else did he level up besides his direct skill? I'm just curious...