x and z WR

I started thinking about the WR competition and really who is up against whom. We never really talk about the different positions.
X receiver stays on the line and will get jammed, should be bigger and fast, more of a deep threat, be a good blocker.
Z receiver is more of a possession type, lines up off the line, and can go in motion, generally agile and quick.
For the Rams I see Britt, Quick, Williams,Thomas, and North as X receivers. I see Tavon, Cooper,Spruce, Marquez,and McRoberts as Z type receivers.
Obviously Britt is the number 1 X receiver. You have Quick, Williams, Thomas fighting for two positions.
The number 1 Z position is Tavon. Let me say I think the slot and z receivers have similar characteristics and are interchangable. You have Cooper, Spruce, Marquez, and McRoberts playing for two or three spots.