I hate to be this guy but what is the role of a Teciever? and if hes the #2 who is the number # and how many do we need to carry on the roster?
That being said It is possibly he could be. Will be better informed once camp gets here and see who all is actually on the 53.
I think you are setting your expectations a little high and also not giving Grant enough credit.
I know it seems that rookie WRs make an impact sooner then they used to, but it is still the exception and not the rule. In 2017 only 2 Rookies were able to put up those type numbers ... TY Hilton barely put up those numbers his rookie season; Deandre Hopkins didn't, Jarvis Landry fell just short, Antonio Brown didn't, etc ... Those are high expectations for any rookie WR; especially a 6th rounder.
Not saying it can't or won't happen, just that I wouldn't count on it.