Yeah there weren't enough missions, but for some reason the first one wasn't replayable. I don't know what you mean by the last one, though...I don't recall. I thought it was the one where the hive was awakening Crota. You can reply that one...in fact, it's often times a daily bounty. I would even like to have Eris's "Eyes of The Forgotten" urn mission to be repayable, that was fun, and crazy.