That is irrelevant. Since Asmo himself decided to enter the pantry a few seconds before he did, there is no way someone watching him could have figured out his location and beaten him to it.

That is not the meaning of roadkill at all. Spinning words to make it fit your theory is a classic sign that you care about your version more than the authors.

Exactly. But you're saying the killer worked to create that opportunity by closely following Asmo's movements and somehow divining his destination before he knew of it himself. That is not a crime of opportunity. That's called stalking your prey before offing him, and that doesn't depend on chance at all.

Why? It shows something important. Whoever the killer was, she/he was in an area where excessive Balefire was used some time ago. Meaning said person almost certainly came there after Rand followed Rahvin into TAR. There's the issue of timing, and it in no way precludes a person hiding there chancing upon Asmo and killing him.

That implies a deliberate intent to kill Asmo being the sole purpose of the killer's presence in Caemlyn, which doesn't fit at all with RJ's statement that this was a murder of opportunity.

First off, where was this idea from?
Secondly, Padan Fain can do it does not mean any mortal can do it. He's got Mordeth in him, and has any number of powers that people like Slayer simply do not posses.