Well, fair enough, but at the same time the new "big bad", Golb, is so under-developed compared to Lich... and, well, most other villains of the show too. Lich had a very long and detailed storyline throughout several seasons, and was probably the scariest shit a cartoon is willing to show without becoming completely "not for kids". Hell, some might even argue they actually went too far in some cases (quotes from "Crossover" episode, anyone?). Golb, on the other hand, was mentioned in like 2 or 3 episodes in the entire show, and never was those episodes' focus anyway. So in this case, I would probably prefer redundant Lich instead.



However this might be not creators' fault anyway, since in seems like CN wanted to close the show as soon as possible without actually cancelling it completely, so maybe original story for Golb's arrival was much deeper, but was cut down in the end to a single final episode and a brief mention before it.