Good catch, I mistakenly forgot he redshirted his first year on campus.
From what I understand, Yurcich's job this spring was to teach the offense to Fields and the other QBs, and ensure they can execute it to the highest degree possible by August 31. That involves both the physical and mental aspects of the game and is no easy task. Day is definitely leading the charge in terms of what the offense as a whole will look like from a scheme perspective, with input from Wilson, as well as Yurcich, Stud, Alford, and Hartline. Over time, Yurcich's role will assuredly grow within that group as he becomes more familiar with the system, but for right now, his main focus is Justin Fields.
From what I can tell, Yurcich's main job this spring was coaching the quarterbacks more than affecting the scheme. Given Day's role as HC, he can't be working with the QBs on a day-to-day basis, meaning this is still a huge role for Yurcich, even if he's not the one calling plays or leading the game plan.
Defenses HAVE to teach gap responsibility, not just reckless running for the ball like a kindergarten soccer game. However, making sure players always know which gap is theirs and know how to defend it (inside vs. outside, on the line vs. second-level, who/what to read, etc...) is key to success. Mattison's goal is to try to replicate these situations as much as possible so that all 11 guys feel comfortable with their responsibility on any given play, and are able to simply react instead of trying to adjust on the fly.
Alabama's 2015 defensive playbook is 543 pages long. Saban's scheme is more complicated than most NFL teams.
However, he has mastered the ability to teach it to his assistants in a way that allows them to teach it to dozens of new players each year. He makes something very complicated seem simple. The inverse was happening at OSU last fall IMO.
Think about how many of those clips featured Arnette, White, or Sheffield plugging a gap while Werner, Harrison, or Borland were completely taken out of the play. Guys were expected to do everything instead of being masters of their domain (i.e. middle linebacker plugging inside run gaps, corners playing receivers in coverage, etc...)
To be fair, Young and Cooper weren't the DEs getting caught out of position inside, but rather the younger guys like Harrison and Potter. Both obviously have a lot to learn and shouldn't be expected to know everything just because people put a bunch of stars by their names when they were 16. That said, the Counter play is a nice change of pace to the tight zone and was a major part of Buckeye game plans in 2014 (as James L eluded to multiple times on the BTN broadcast).
One is literally pictured and quoted above by Baker himself.
Alabama (not surprisingly) does this quite a bit against spread teams with their 'Money' backer, which is essentially just the weak-side version of the Star. Saban uses those positions to work in younger DBs that haven't completely separated themselves and earned a spot on every down, as he still claims to run a base 3-4 defense (though he's really in nickel most of the time). Either way, he teaches the Star and Money roles to every DB on the team and just picks the one that fits that weeks opponent (run-stuffing vs pass coverage).
Fair question, but the 4-over-3 and 3-over-2 system of dropping 7 only happens if the offense sends all 5 receivers out on pass patterns. If they begin keeping a back and/or tight end to block, then the defense can begin planning for such looks with blitzes.
Also, it’s important to remember that these are base defensive looks, and are really meant to be called as a split-field technique, meaning they might right run Palms/2-read to one side and run man coverage with a blitz to the other. Essentially, by teaching this technique of matching patterns in different ways allows Hafley and Mattison to employ it all over the field and mix in man coverage, traditional spot-drop zones, and blitzes as the game plan might call for.
If nothing else, it speaks to Saban’s ability as a teacher. Certainly, his recruiting prowess is the #1 reason he’s won so many rings, but I know most coaches (at every level) are in awe of his ability to teach so much to teenagers in a relatively limited amount of time.
Point being, its very rare to find someone who can replicate his style.
To answer the OP, given what I've heard from Yurcich in only a handful of interviews thus far, it does sound as though this is going to stay as Day's offense, with the head man continuing to call plays. Yurcich has stressed that his role is to learn the current system and teach it to Fields and Baldwin, and his primary duty will be to develop those QBs, not re-write the playbook to look like OKST. I'm sure he'll be heavily involved with game planning, but I don't expect much to change, other than they'll try to take advantage of the QB's strengths as they did for JT in '17 and Dwayne in '18.