I lol when people say this. My friend and I can go through it just two of us, so in theory even if we had 4 level 27s we could get through it. We take our friends underleveled alts through it all the time and vice versa. Don't be one of those level douches, those are the worst people in destiny. I won't play with people I don't know anymore mainly because of this. If you're gonna be a dick about levels then play with yourself.