Dak, in particular, is the one I"m concerned about. Going from never having taken snaps behind center and never calling plays in a huddle to developing the skills for both while learning to make NFL-defense adjustments at the line with a brand new playbook---that's an incredibly tall order. It's hard enough to QB2 when you know the system, have had a couple of years to work on your mechanics full-time and have at least called plays and read live defenses in a handful of NFL games.
Showers is in the same boat, but a year ahead. That year helps, but he had farther to go and less to work with.
If I had to pick, I'd go with Showers if I had to, just to not ruin Dak by giving him too much, too soon. We really ought to have brought in a vet to push Moore in the first place instead of handing him a job he hadn't earned yet outright.
That said, I'm sure you're right that we pick up a QB at cut downs somewhere along the way. We'll move Showers back to the PS or let him go outright, and stash Dak to develop him. Next year Dak ought to be pushing for that QB2 role.
And since we're in wait and see mode anyway, sure, if Showers or Dak shows somehow they've got enough to hold the QB2 role, great. The chances of them doing that legitimately (and I mean not just the team sticking with them because they didn't give themselves options when it was possible to do so) are slim.
For the record, I do think the team is quietly pretty high on Dak. Not just with Jason spending time with him. If you heard the Linehan segment about him last week where he was talking about his son (college QB) watching him and commenting on how poised he is. Who knows how significant it was, but it sounded like a tidbit from a positive conversation about the player after the first few weeks of his first offseason.