Disconnected Bits of ME:A Story

Thanks, I get stymied by the radiation, so I didn't investigate Site 2 until after I had clearly the sky (but before actually going to Fairwinds Basin to trigger the outpost deployment)... so that's where that bit of info is getting disconnected from its story line.

Here's another encounter where I'm not getting any indication of a possible quest, yet it seems like it should be part of something else. I got turned around on the map trying to get to Fairwinds Basin and drove into a cave where there was a bunch of Kett. Just as the fight started, either Cora or Vetra asked Ryder if he thinks they (i.e. the kett) found the Salarian Ark). I was expected some sort of quest to come up in the journal then after the battle finished and I looted the cave... nothing. Should I backtrack and avoid this encounter (expecting to be sent to this location from somewhere else)... or, alternatively, what am I missing that triggers a quest here?

Thanks again.  I'll relax a bit... I've been worrying about triggering areas that belong as parts of other quests.