I've done kings with guild mateys and by myself.
Although it was a fun challenge to see if I could do it totally by myself, I think part of the fun of the grenades quest is doing it with others. There's never a shortage of people wanting to help, most of the time there's too much help and we lag tons. So I don't think I'm alone in thinking doing the grenades quest with others is fun
ps - don't need to relog, just need to change oceans