I posted this in the Picture Pages thread, but I am going to post it here as well to hopefully start a conversation on why I might be wrong on what I saw in this play:
I think Siller is making two reads, the tackle and Roh. I could be wrong about this, but its how it looked to me, like the stunt was designed to cause the wrong read. On a keep, Siller heads straight upfield, so he reads where the tackle is (looks like Martin is getting kicked out, really he has contain) and he sees Roh (who is unblocked, further making me believe he is a key) making a move with the the RB, so he keeps. He doesn't have time to see Ryan crashing inside on the stunt, so he read his keys right, but those were keys we set up to be read that way.
It looks to me like the playside guard is shooting upfield kick the backside linebacker out of the play (who isn't there) and the pulling guard is either supposed to head outside or simply find the first man inside he can (kind of like you said).
Like I said, I could be wrong but I really think Siller was keyed on the backside tackle and playside end.