Not trying to be contrarian, but i think most of CJ's passing/assists usually come when Dame was on the bench and CJ ran the show. Maybe it's anecdotal, but it's something. Don't think we can just blindly look at stats without looking at personnel or role.
Primary Backup PGs
2015/16: CJ, Tim Frazier for 35 games, Brian Roberts for 21 games (neither of these two played even 10 mpg)
2016/17: CJ, Napier for 53 games (9.7 mpg)
2017/18: Napier (74 games --21 mpg), Wade Baldwin (7 games, 11 mpg), CJ
2018/19: Turner (73 games, 22 mpg), Seth Curry (74 games, 19 mpg), CJ
2019/20: Simons (13 games, 21 mpg), CJ
I don't think it's a coincidence.