The throwing motion looked fine to me and his accuracy wasn’t in Mannings territory but it was NFL starter territory.
The flaw I saw in Osweiler, and I am sure this is even more exaggerated cause manning was throwing passes right there too, is he was throwing the ball late. He wasn’t anticipating the receivers break and making the throw before the break. He was making the throw at the break. I think Manning and the coaches will coach him up but that was the most glaring issue. In this league you can’t wait, you have to anticipate and throw.