Mu Lung Dojo

I had a question.

I know the Dojo is able to be entered by levels 25 - 200, but can, say, a party with a level 80 and a 40 be done? Or does it have a limit on how far the level gap can be, like the Boss Rush PQ for the Agent Quests?

I ask because while he wouldn't be very beneficial, I plan on bringing a low-level friend to help him get the White Belt, at least, along with the rest of my friends in the party.

Also, is there any mention or what not of the Belt Scrolls?