That damaged part looks too big to be part of a mech. More like the landing skids for the Prometheus, methinks.
Mortor Pots? Explosion, plus that white joint, looking thing, seems to have some burn marks on it.
Also that section of what looks like the Derelict, maybe it's not the derelict, maybe it's some other Jockey structure. I hope we get to see more than JUST the Derelict.