No one is really even attempting to answer DD's question...
I'd say for top-end RBs, quite a few pan out. People saying Fournette was last year's Zeke, or that Zeke was that year's Gurley, etc. But obviously RB is the one position where the stud prospects are REASONABLY projectable going from college to the pros.
Lots of people said Evan Engram would be the next great mismatch TE, and he's off to a roaring start.
Ballage as this year's David Johnson seems like a pretty safe bet...
LUCK, Flacco, J Allen
MIXON, AP, Collins, Ajayi, D Martin, Chase E, R Smith
HILL/DIGGS/KA/EVANS/HILTON, ARob, Sammy, C Davis, Tre'Quan, Ateman, Foster
GRONK, Vance, Herndon, Shaheen
DL: CHANDLER/CAM JORDAN/FLOWERS, Short, Golden, Addison, Sheard, Larry O
LB: KENDRICKS/WARNER/ZACH C, Schobert, Williamson, R Evans, A Walker, KJW, Bynes, Kyzir
DB: ADDAE/AMOS/SIMMONS, John J, Kazee, TJ Mac, Diggs
RIVERS, Jimmy G, Dalton, Eli, Colt M
GURLEY/DJ/MIXON, Guice, Gus E, J Wilson, Chase E, Darkwa
NUK/HILL/KA/EVANS/AJG, Golladay, Sammy, David Moore, J-Wash, Foster, Patrick, Sherfield, J'Mon, JMatt
ENGRAM, Doyle, Vance, Herndon, Higbee, Everett, Hollister
DL: BUCKNER/BARNETT/GRIFFEN/HEYWARD, Golden, Short, Autry, Ogbah, Wolfe, T Bryan, N Spence, Simon
LB: BURFICT/WARNER/HITCHENS, Danny T, KJW, Ebukam, A Walker, Vince W, Morrow, Hodges
DB: GEATHERS/POYER/JOHN J, Diggs, S Williams, Phillips, Kazee, Whitehead