Longyac can respond on his own, but I'll add a few thoughts here.
1) Wittik was never ON board with Texas. I don't ever remember seeing him put on a jersey or take a single class here.
You keep saying this, but it really isn't an answer to anything. Buechele wasn't "on board" with Texas either before signing his LOI and enrolling, but the coaching staff certainly felt assured enough about his intent to attend Texas that they weren't recruiting other QBs. The staff felt the same about Wittek -- up until the time he got kicked out of USC in May 2014, at which point there weren't any other viable options.
2) The above being true, when the staff "lost" Wittik is when they could have gone after Kohlhausen or WHOEVER else. No one is saying he should have xferred to TCU and then left there to come here.
Kohlhausen announced several weeks before Wittek was expelled that he would transfer to TCU. What other appealing candidates were available in the middle of May? (By the way, you mentioned Brewer earlier, but he wasn't an option for 2014. Tech blocked him from being able to transfer to a Big 12 school without having to sit out a year.)
And he went all in on Wittik AND MISSED.
He gets the blame for that. Why excuse it?
Ultimately the blame will rest with Charlie for
everything, because he will be retained or fired based on his win-loss record. If the refs were to rob us of three wins next year in the same fashion that they did with the Okie State game in 2015, Charlie will still take the blame for that too; no one is going to excuse, say, a 6-6 record that would have been 9-3 if the refs hadn't been crooked. The three losses may not really be Charlie's fault, but he would still take the blame for them.
Even though the blame rests with Charlie as it will everything else (just as it would have if Buechele had decommitted a few days before NSD), the point here is only that the failure to bring in a grad transfer in 2014 was not due to some sort of negligence on his part. Any coaching staff looking to land a grad transfer ultimately goes "all in" on one guy. How often do schools land more than one grad transfer QB? How often are schools pursuing more than one candidate with a little over three months before the season begins?
The staff felt certain that they had a grad transfer QB until events that they could not have reasonably foreseen occurred to prevent the player from graduating. What else should Strong have done in the middle of May 2014?