Spencer Rattler’s first start was…

Most of those open receivers were later in the read progression and he did not have time to get to that read.

As far as drafting a top talent sure, but that guy isn't likely to be in the draft this year. I don't really like any of the potentially draft eligible QBs this year. Maybe the next draft.
I don't buy it. Just looking at that last real drive in the 4th quarter, he had Shaheed wide open in front of him on 2nd down. Then on the 3rd down roll-out, he's got a WR streaking as his first read. He threw it over the top out of bounds to Shaheed instead.

If it wasn't a single read, he wasn't doing it today. Could he get better? Sure. Could he not? Sure. We have no idea after this game.