Time to start Book

Worst case scenario is that we get a top 10 draft pick. Best case scenario is that we discover we have a QB on our roster who will be cheap for 3 more years.

It's obvious that neither Hill nor Siemian are the answer. And the jury is still out on Winston.
But you really don’t learn anything about Book by throwing him to the wolves because there aren’t NFL receivers on our team.

He’d be eaten alive and broken.