That's probably because part of the problem is there isn't a whole lot of logic involved in Seth's emotional progression or thought processes. And what little there is, he doesn't know how to articulate to actually let Daniel in on it. Half of what he's upset about isn't even Daniel's death and subsequent return, but what happened in between.

"I dunno, did you?" he asks, then draws a shaky breath and tries to focus his efforts in.. actually making himself understood. Cluing Daniel in on what's going on in his head. "I mean... Do you know what's happened to the rebel base?"