Offenses based on 4 verticals tend to employ more 10 and 11 personnel which Grubbs intends to run. However, that isn't always true because the Ravens OC Monken uses 4 verticals for his offense but he was influenced from D. Koetter. And D. Koetter employed a lot of 12 and 13 personnel while he was the HC of the Tampa Bay Buccaneers. And the other layer is that the misconception is that offenses based on 4 verticals do not run the ball but that isn't true.Although I'm primarily encouraged by what Laviska Shenault brings to Special Teams, he does reinforce and expand on what the wide receiver group makes possible.
With the exit of two experienced and very capable tight ends from the roster, we may see less in the way of 12 and 13 personnel and more 11 and 10 personnel.
So having physical WRs is pretty important in a 4 verticals offensive system if you want to make draw plays work for example. WR's have to be physical with DBs to make it work. Shenault is one of the more physical WRs and fits into what Grubb's wants to do on offense. But Shenault has to make the roster and survive the possibility that the Hawks take a WR in a deep WR draft. And JS loves drafting WR's so he will draft one or two for sure.