I'd have to think the state produces fewer 5-star DTs compared to any other position on the field, so it's already somewhat of an uphill battle to begin with because those guys usually reside in states like Louisiana, Georgia, Florida, etc. You do bring up a good point with JJA and there was David Hicks in 2023, although that one had the dad being the head coach of the A&M feeder school.
I'm sure Bo has a way he wants to do things considering where he is at in his career, his previous stops, and his tendency to job-hop about every 3 years. I was definitely surprised he wasn't reeling in more high-end guys but DT is definitely the hardest position to recruit and probably has the most intense NIL battles due to supply and demand, which often involves factors outside of the position coach.
Baker definitely didn't walk into the best situation, and some of the guys Bo laid the groundwork for Texas chose to just back off of completely, but Baker is paid to figure it out and deliver results.