2 receiver sets has me a bit concerned about the double teams Geremy is going to see in every game. They are going to néed a TE or TB to release to keep the pass defense honest.
No idea how the current defensive coaches (and we got one that was real good safety) and the QB coache teaches, but I can say that this you are pointing out is not a WR v CB battle. It is a QB v safety battle mentally. Way back I was taught to build thought progressions from a concept 'middle field open' or 'middle field closed'. Same concepts that the QB is looking at from his side of the line and the safety (s) are coordinating the defense from the back on their side. From there its a simple matter of counting, understanding alignments and spacing and the winner of the QB v safety battle will be the one that either finds open space for the ball or closes down the open space the offense can go with the ball.
It is entirely possible that if Geremy Davis at the X is going to draw coverage rotations, whoever the Z and Y(TE's) are, will have balls coming there way all day long. Davis may not have the kind of season he had last, but that wont diminish what he is capable of at the next level at all. The few people that actually watched Cochran at the end of last season, he can find and anticipate the spaces. Just needs time, which comes from a running game successful and guys that can block up front.
Edit FYI Don brown defense was so effective because the entire chaotic mess in appearance was actually a very well thought out plan to completely disrupt any effective progression of reading the defense by a QB while still maintaining disciplined gap control in run defense. The defense was so effective top 10 in the country because he had 2 corner backs that could maintain single coverage and edge gap control in run. Both are in the NFL now. The other 9 players on D could line up anywhere as long as it was a disciplined gap control against the run and generate pass rush from anywhere and confuse the QB. It was a fun defense to watch. Edsall's D worked but we're boring. I WOULD take boring and winning in a hear bear by the way.