Football nomenclature varies, so please excuse my version.
X is the split end who plays on the line. Tends to be the number one guy, also.
Y is the deep threat who plays off the line
Z is the slot who is quick and runs good routes.
H is the halfback in a receiving position for my purposes. In a bigger package a fullback or tight end in a halfback position is often called an H-back.
FL would be a wing back sort of guy in the classic sense of the position. A tight end, fullback, or utility back. A big receiver is the modern day fit.
I submit that our z is Roscoe Parrish. Candidates for Y include Easley, Chad Simpson, Steve Johnson, and Felton Huggins.
As FL or Z, Donald Jones fits the bill. He has explosive strength and power for a receiver. He is similar to Josh Reed.