I didn't hear whispers when Libby appeared (like we did when Regina appears in jungle) just hear a bit of music that played in the hatch. I think Libby is just the one who Michael feels MOST guilty about, so he has nightmares...

Get'm Libby. What kind of role model is a dad who kills unarmed innocent people?

I try to remember that
whispers...the others appear/disappear from nowhere
clicking... smokey is nearby
whoosh...flashback or flashforward
no whoosh ...but same person in different scene- mind time flip