He isn't a prototypical #1 WR, but can be a very good #2 WR who is playing #1 which isn't a bad thing in todays NFL.
Lions have 2 #2 and they are both very good in Tate and Jones III.
Vikings have 2 #2 and they are also both very good in Diggs and Thielen.
With todays spread type offenses and with bigger CB's the prototypical big #1 WR is more great but is also a huge hindrance on salary cap space and takes away from having a truly diverse offensive scheme of playing the matchups.
Guys like DJ Moore and Anthony Miller aren't going to be Julio Jones and AJ Green type guys but if I can get guys who can create separation and make plays with the ball in there hands your offense will have consistency because you are reliant up 1 WR.
With that being said DJ Moore is exactly what I'm looking for in a WR, and if I can cut Dez add cap space to re-sign our own and maybe go out and sign someone like Emmanuel Sanders to a 2-3 year deal I think this offense is better off.
20+ years ago when that prototype was first figured DBs could handcheck downfield, hold, and that sort of thing. You had to be big and tall to overcome coverage consistently as smaller quick guys could be impeded easily. Nowadays that is no longer the case. Guys like Antonio Brown and OBJ are new examples of an alternate WR1 prototype. They are fast and moreso lightning quick.
People are underestimating his shuttle score and what it means. Athletically he is similar to OBJ who ran a 4.01 shuttle. Golden Tate ran a 4.3 shuttle for example.
I put this insistence on the 6'3"+ receiver in the same place that I put the insistence that a running game solves all ills. It's obsolete thinking. It made sense when people learned the game 20+ years ago but it doesn't parse these days.
Quick, speedy guys can dominate just on those traits alone nowadays. For my money OBJ and Antonio Brown are the best WR in the league. Moore fits that mold and more because he is built like a RB. Moreso he fits Dak's skills better than what people consider the prototype. Dak doesn't throw a good jumpball and does best with clear separation given his inconsistent accuracy. Guys like Jones and Green would not be used fully here with this QB like OBJ types would be.
Moore is abetter fit.