F: RB/FB/Fback
H: RB/FB/Fback/WR
Y: TE1 Witten/
Z: FL Austin/
X: SE Dez/
U: TE2 Escobar/
J: WR4
About as far as I can go right now. Williams is more an X but terminology tells them where to line up. I don't know if Garrett runs a modified Coryell terminology playbook or not. Here an 896 tells the X to run an 8 or sq in, the Y to run a seam and 6 to run a skinny post. I'm betting its much more complicated. So whoever practices that week has to know the plays put in for that game for his position. It's a lot to ask young WRs to know all the WR/TE terminology and routes so they generally only get one or two assignments which restricts where they play esp if they can only run a few numbers on the tree from that position. Or if you must play them then you have to call plays they know or you will see confusion on the field (which you do) so the playbook shrinks.
The point is the more versatile a receiver is the more valuable come game day. I think Williams will be an outside guy with some slot plays and the occasional 3-5 receiver sets positions. Harris can play slot but some outside. He can't stretch the field but he can get some separation downfield and he runs digs, slants, posts and go routes well. Austin is the most versatile followed by hopefully Dez. I have no idea how the rest will do much less where they might play. Escobar is smart and knows the tree. He just needs to learn the terminology the Cowboys use. He can play the U, some Y, and any other position. I don't see him doing a lot of hback but he'll line up in the backfield some and do some sprint, sneaks, run and flat passes including motion.
Some fact and opinion here.