Yeah, I watched the game the same as you. Hockenson learned the playbook in 1 week - you just described how he learned it.He didn't learn it in (less than) I week. I explained how they did it.
My argument is that a rookie would not not know the playbook at all, but would know it less well than a guy who was drafted in 2020, went on the practice squad for 2020 and 2021, and has now made it up to the active roster.
Does the rook still not know it well enough that he can't start over that guy? Him not playing last week might seem to indicate that. But now that guy had an awful game, and might give the coaches a reason to reevaluate if the rook can do it.
I don't think anything about that is unreasonable or impossible.
But realistically, with the short week, I would not bet on it happening. But if Brandel has another terrible game, they have to do something. They can't just sit there and flush the season down the toilet.
* this also obviously depends on if Darrisaw is done for the year or not.