Why didn't it make sense? The Cowboys had a 2nd round grade on him and used a late 4th to get him. He is still on his rookie deal so there is plenty of time to see if the light comes on for him or not. The plan is to wait and see what happens. Simple as that.
The Cowboys are going to extend Dak, we already know that will likely happen. He is 7 years older than Lance. If a few years if Dak gets hurt or retired Lance could step in. Maybe he will improve to the point of taking over for Dak.
Your second paragraph confuses me. Jerry doesn't believe in blowing up the roster. He thinks we are a contender, so why even consider that notion?
That's good and all, but you just restated the crux of my argument that this trade made no sense. Dallas was always basically going to be forced to resign Dak this offseason whether they liked it or not. They were not going to eat a $59 million cap hit with his current contract or cut him and absorb the $60 mil in dead money. The timeline just does not seem to be favorable to inserting a developmental QB prospect when you have a win-now roster and a QB that you are essentially handcuffed to.
Again, what my second paragraph is meant to do is to point out what you just stated: Jerry doesn't believe in blowing up the roster, which is why I just don't understand the point in using a 4th round pick to trade for a QB that has a very good chance of never being anything more than a spot starter for you in the foreseeable future.
I very well could be wrong about all of this and honestly will be happy if I am, but if they were willing to let go of a 4th rounder this year, why wouldn't they use it for a piece that could help put you over the top? Gilmore and Cooks were had for less and have been significant contributors this season.
This is all just my opinion of course, but I just view it as a strange move when you consider context surrounding it.