Yeah, I think something is adding up.
Anyhow I'm going with Kurt as those are normal speech bubbles not telpathic tought bubbles like when we see Jean and the Professor talking. There was someone in that room who had the ability to vanish before Scott turned on the lights. Only two people in the mansion has that ability, and Kitty isn't quite that quick, nor would she not want to be seen with Jean by Scott. And Kurt from his 616 history and from what we've seen so far seems to be the reflective consoling type, which fits with that conversation.