He never truly looked at PBJ's qualifications or lack thereof. It was a hurried hiring process largely directed by CB to ensure that all of the assistants he had assembled, including his son, survived for another year after he left. Losing players in the portal was a ready excuse to maintain continuity, but this was about CB calling his shot on the way out and forcing TB's hand.
The reality is that TB should have done more to vet PBJ and tell Bohl that it was nice to have his recommendation, but that he had work to do to get the best possible coach hired. Instead, he rubber-stamped Bohl's guy. It allowed him to avoid the hard parts of transitions - notably the part where assistants and their families are thrown into upheaval - all which I can sympathize with but can't say I respect as it very clearly conflicted with one of his central job responsibilities: to always look out for what is best for UW, the football program, and its future irrespective of what is easy.
Whether PBJ's deficiencies would have been identified by a committee or not, the reality is that if you had 4 qualified applicants, even a blind monkey would've passed on PBJ. The reality is, this was only a "search" if you consider the hiring of one, pre-ordained candidate a "search."