Ted Ginn is NO Hill, I'm not even going to try to put them in the same league other than footspeed. But when we had Ted Ginn, even though he wasnt the stud we hoped, the other team HAD to keep one safety shaded over to respect his speed which opened it up for our other stud WRs like Hartline, Bess, Cammarilo. But also with the team having to respect Ginns speed, it opened up the running game because you cant keep 8 in the box if you have a guy that can go over the top at will.
Kupp is elite route runner who will almost always find a way to get open. that isnt Hill, Hill is just dangerous. But also what makes Hill more dynamic is the fact that teams have to respect that Maholmes can get the ball 65 yards down field to Hill. I know tua had the longest yards in air pass of the season, but if a WR gets 40+ yards downfield, most of the time the CB isnt gonna respect a laser over their shoulder like PM could throw.
But i really see McD having a lot of insight on the WR room, possibly just as much as welker. he only coached WR for 2 years, but his eyes sort of lit up in one of his interviews discussing "im going to teach the WR how to never get touched at the LOS"