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I don’t think Leto would’ve been able to go through with the Golden Path either if he had ever been a normal human. Leto even calls himself an abomination which is what the Bene Gesserit were testing for at the beginning of the entire story. Paul is a human so he has flaws and can’t follow all the way through with dehumanizing himself to realize the Golden Path. Leto was never human in the first place. He was an abomination so the path was achievable for him. That’s my interpretation anyway.
That would be like me declaring repeatedly that I want to marry Sydney Sweeney. If she was making every minute of my life a living hell…I might be onto something here.