There are a number of variables at play, and even the best individual staff can't control whether the new coach has someone hand-selected for their area of expertise. Nor can they control preferred scheme (DL has one coach in a 3-4 defense, a 4-3 typically has two).
As a general rule, a head coach wants a good balance between teachers, recruiters, and X&O guys. The more narrow the position you coach (RB, TE, DE, DT) the more you'd better offer in other areas. Conversely, an elite technical OL coach is always desperately coveted, irrespective of their other value adds.
My guesstimates on order of likelihood of retention, most likely to least. Assuming we're operating from Any Head Coach. Saban alters the calculus in some obvious areas.
Patrick Suddes - The Saban product knows the recruiting landscape and he gets the bigger picture. An obvious retention.
Larry Porter - A strong recruiter with a national network. RB coach exists to provide recruiting value. If he's replaced, it'll be because the new coach thinks they have an upgrade or they have some negative prior history.
Darrell Wyatt - Wyatt has a solid reputation as a teacher. The 2013 class will be an interesting test of his evaluation and developmental skills. He's also capable of coordinating a passing game.
Stacy Searels - Proven to be a tireless recruiter and has a strong work ethic. Gets effort from his charges and Texas saw a significant uptick in unit performance this year, largely wasted by developments out of their control. I question whether's he's an elite technician or teacher. Recruiting and motivation is important here, but teaching is primary. And he could be replaced on that basis.
*Oscar Giles - All Oscar does is churn out NFL DEs. Giles is the classic narrow pure position coach with minimal value add. He's not going to coordinate your defense one day, nor is he a rainmaker on the recruiting trail. The question is whether the new coach wants an added value asset here or is he content to simply get excellent coaching. *A 3-4 defense likely leaves him without employment.
Duane Akina - Many Longhorn fans would have Duane at the top for his contributions to DBU. While I respect that history, Duane has (very understandably) dealt with the Mackvironment over the last few years by creating his own world, often incongruent with his coordinator and the mixed coverage demands of the Big 12. If retained, he'll have to show that he can operate in someone else's program. And credibly teach team concept zone.
Bo Davis - A mystery. No staff member has more conflicting reports as to competence, ranging from fantastic to head-scratching. If it's Saban as head coach, we'll find out quickly whose idea it was that he leave Bama.
Major Applewhite - Applewhite's 2013 management of the QB position and a compromised offense took a good bit of the bloom off of his rose. Remember when we used to hear about him as Mack's potential successor? It's tough to get a true gauge on any Mack Brown OC, but Applewhite's 2013 audition didn't win over the room. He'd find employment elsewhere easily and if he is retained, I'll wager it's as junior man in a co-coordinator gig.
Bennie Wylie - He could benefit from a head coach who doesn't have defined ideas on S&C and retain his position based on player popularity and a simple desire for continuity. He was a C+ or B- hire replacing a F.
Jeff Madden - I guess he could be retained in some sort of figurehead position overseeing "Athlete Development" or some other BS.
Greg Robinson - He served his temp contract well and will not play a role in a future coaching staff.
Bruce Chambers - This has to come to an end at some point, yes? The staff's most amusing, inexplicable character has his future hopes resting on a clerical error.
Pick it apart.