Yep you are pretty stuffed unless you decide to play 60 - 90 quickplay matches to get the 4 high level engrams from maxing the valour rank. The raid gives you 4 for calus and a further 2 for eater (I'm ignoring the new raid layer as it's tedious as f$%k). You will also need to go flawless in Trials as another engram is hidden behind that toxic mess. I wonder if Bungie have realised that this is why most people are gone i.e. the majority of people, whether in clans or not, were playing largely solo.