slot WRs traditionally play a very specific role and general play the slot because their skill set doesn’t allow them to be as effective outside. Most times due to speed and height limitations. Think Edelman in New England or Amendola. I wouldn’t say Kupp is elite in the slot because of what I saw when Cooks was gone from the offense.
Kupp is very good though and in the slot when teams have to worry about the Rams 1 and 2 he can be deadly. But IMO it’s contingent on those factors. We haven’t seen it not be