What if Aiyuk's reinstatement gave Shanahan his full offense back?

This is a hypothetical, and a long one. Brandon Aiyuk applied for reinstatement, and his agent, Drew Rosenhaus, told ESPN he plans to report to the facility Friday. ESPN also reports that release is the more likely outcome and that Kyle Shanahan and John Lynch have said Aiyuk has played his last snap in San Francisco. So treat what follows as a design exercise: if he did play, what would Shanahan do with him?

The baseline is already good

The Niners score 28.1 points per game without Aiyuk. Shanahan did not need a rescue, which makes the question narrower than it sounds. The issue is where an extra receiver would fit in an offense that already has its habits.

The target distribution shows those habits. George Kittle sees 22% of targets, Christian McCaffrey 20%, Mike Evans 19% and Deebo Samuel 10%. Four players take roughly 71% of the looks, and the biggest share belongs to a tight end. Any target Aiyuk gets comes from someone on that list.

Personnel: more three-wide, less compromise

Shanahan builds his offense on formations that look the same before the snap. With Evans, Samuel and Aiyuk, he could run three-wide sets with Kittle or McCaffrey flexed, and keep a run look on the field. Defenses would have to choose between a lighter box that McCaffrey can run against and a heavier one that leaves Aiyuk and Evans with single coverage outside.

Evans is the natural winner on the other side. He draws the matchup and the safety help, which in theory frees Aiyuk on the routes Shanahan has long liked for him: crossers and digs off play-action, where the quarterback gets a clean look after the run fake.

Play-action and yards after the catch

The concern is overlap. Samuel is the Niners' yards-after-catch weapon, and his 10% share suggests he is already a secondary piece. Aiyuk would compete for the same intermediate, catch-and-run touches. The most likely adjustment is Samuel moving more toward backfield and motion looks, with Aiyuk taking the true receiver snaps. That is a guess about roles, not a measured result.

A fair estimate is that Aiyuk would cost Samuel and Evans a few targets each and Kittle very few. Kittle's volume comes from the middle of the field, and Shanahan has no reason to cut that off.

The part the model cannot fix

Fit matters less than the obstacles. Aiyuk is not on the roster and is not being paid. ESPN reports the Niners will have to decide what to do with his rights. A return would mean the team and player reversing a public break in the middle of a season in which the Niners already hold the top seed in the NFC, according to Niners Nation.

The best case for him is simple. Shanahan has the pieces and the points. Aiyuk would give him one more route runner who forces a defense to pick its poison. The best case against him is just as simple: the offense is working, and the cost of changing it comes from the locker room as much as the playbook.