This is kind of a lazy stereotype for a guy built like CJA (not picking on you; I think a lot of people view him this way). Sure, he didn't get a ton of targets, but the team liked Booker who hasn't showed much as a runner, so Booker got some of those snaps. But when given the opportunity, CJA has show well as a receiver. But even more importantly, he's solid in pass pro:
https://www.milehighreport.com/2018/1/25/16932080/cj-anderson-grade-2017
Couldn't find a nice 2017 highlight reel for him, but here's some clips from a single 2017 game:
https://www.youtube.com/watch?v=MSKdXwAnL_o
I know he's 3 years older than Drake and isn't a shiny new toy, but the guy has career averages 4.4 ypc and 8.3 ypr. His pass protection and ball protection may not be valued in the fantasy community, but NFL coaches value it.
I'm not trying to tell people to go out and grab CJA. I'm just trying to point out why he might overtake a guy like Drake. He's got skills coaches appreciate and Adam Gase is a known CJA fan, having already tried to sign him away from Denver 2 years ago.