Pooch, I wanted to make a few things clear.
For starters, the Malik Jefferson you are saying can't be relied on as a true freshman is the same Malik Jefferson that was going to save the TAMU defense from day 1 back when you guys thought he was an Aggie Lock.
Your roster analysis is incorrect. MB2 is a stud, but teams lose studs all the time. Ridgeway finished the season playing at an elite level, and many say he is a 1st round draft prospect. I will also remind you that we lost Tank Jackson not he first game last year, a very good DT who would start anywhere in the conference, and we are getting back. Add to that the fact that Boyette and Poona have been impressive in the spring and we are set at DT. Reed did not play well last year, it won't be hard to replace him, I have a theory that Bluitt who started most of 2014 at WDE and has gained a few pounds will start there, if he does he will contribute a lot more. Hughes on the other side was one of our best players last year, as a RS FR.
Hicks will be tough to replace because of his football IQ, but Malik is twice the athlete, and though he may struggle early he will be a stud very soon. Santos and Edmond are very similar, but I like Freeman coming in and steeling that job. Freeman is very similar to Alaka, in pretty much every way.
Finally in the secondary I was under the impression that our best player from last year was Jason Hall, Duke Thomas is back, as is our other starting S. Diggs will be replaced by Bonney and the only other question mark is CB, where we have Echols, Hill, and Boyd.
I think our D will be just fine, it may take a couple games but it will end up being solid.
Finally this has nothing to do with what Mack Brown left us, he left a disaster at O Line and QB, plus a roster filled with entitled players most of which have already left the program.
It's funny that Texas players are the only ones that are irreplaceable, and our young players will never get better.