At points, Ash looks like he's showing signs of pulling it together, and then he appears to regress a bit. Still, a win is a win. Okafur is a man out there! That was one of the better individual defensive efforts I've seen in some time, although the rest of the defense is pretty meh.
Not sure what you mean by "showing signs." He showed as far back as Ole Miss and Oklahoma State that he was capable of making plays downfield and leading scoring drives under pressure. Since then he has also showed inconsistent and erratic play. I don't personally think last night showed anything other than he played well in the second half.
He's a true sophomore QB playing behind an O-Line that is average at best. He has talent to work with at the skill positions, yet the offense's default more often than not was to play conservatively, and I don't know whether that was due to a lack of confidence in his ability or just a bizarre dogma that "football should be played that way" (I suspect the latter more than the former).
Next season Texas will have a junior in Ash and redshirt freshmen in Overstreet and Brewer. I don't personally believe that Ash earned the right to automatically be named starter - not that my opinion matters - but if he shows anything remotely close to the level of improvement from 12 to 13 that he did from 11 to 12, then he'll win the job and probably have a good season.