I think Zoldyck tried to warn him to be fairYeah he's technically powerful, but he lacks the intelligence to apply it properly. He thinks less than Gon does, the way Morel beat him was hilarious. Morel just thought up a plan for beating him while Cheetu was reading manga. Morel was too nice though...the Zoldyck's had no time for his nonsense.
And I do love Morel pretty much trolling him