A veteran just to talk to can be found really cheap. But I'm not sure that it's really necessary when you have a former NFL QB/QB Coach HC, likely an OC that is a former NFL QB/QB Coach, and you will have a QB Coach. The truth is that I think most of the development and discussions with a young QB comes from the QB Coach who spends the most time with them and only has 3 or at the most 4 players to work with.
It’s not just that. The front office owes it to the rest of the team to make sure they have a quarterback on the roster who has some playing experience and has hopefully won at least a few games at one time or another.
And I’m not talking about a “difference maker” or someone who fans would be calling for to get on the field, just someone who can credibly call plays and take snaps without pooping their pants if called upon.
I also think it benefits young quarterbacks to have a veteran to measure themselves against in camp, plus sometimes they struggle and need to get benched before they get ruined, and you need to have someone you can turn to.