Somehow I think its less important what he "gives" to the guild, when it is for TheEnd... Its not the main guild, but more as a "trail" guild. Or to find out if he belongs in Wave. I see the point with he hasent lvled, but then agian, he might not have the time right atm (but I would like he hear what he have to say to that)..
Idc about the old guilds that much, when he dosent have a bad reputation himself.
He seems like a nice guy, even tough he´s maple skills could improve, wich he have proven already he´s willing to learn more to get better. (like Zin said, he had a break, so it could be a matter of time maybe)
So my vote will be yes, since its "only" TheEnd(no matter how you put it its still the "subguild") and its should be for a "trail" time to see what the guy acually can/will.