Aiyuk had 4 big hurdles to clear to make sense to come here.
1. He needed to be released cleanly (no assets for him)
2. He needed to be cheap (sounds like a 1 year prove it deal is coming)
3. His knee needs to be okay
4. His attitude needs to be okay
It seems likely we can check off 1 and 2.
3 is much harder. He tore his ACL, MCL, and had meniscus damage. Basically 3 of 6 things you can mess up in your knee(ACL, PCL, MCL, LCL, and two meniscuses) he did. Setting aside the rumor mill about his rehab, even rehabbed there's a real chance he's not the same Aiyuk.
4. So I was willing to entertain the "Kyle Shanahan is a control freak and ruined their relationship" possibility, but Aiyuk has NOT acted like a mature actor here. Remember the video of him driving 100mph past the stadium from like 2 months ago? Just a bad look. Who knows, maybe its a Pickens situation but I am skeptical.
1 year prove it deal is fine but he should not be the only WR added. That's dangerous.