Yeldon on waivers. Who do I drop?

My first thought was Ekeler, but dropping an RB for a WR is tough. Brown is my Gurley handcuff. Lockett maybe? Thomas? If he’s in to replace Fuller, Houston might be good for him… I guess.

4-man keeper, .5ppr, 10-man league. Any thoughts would be helpful.

MY ROSTER:

Drop Brown. Kelly will be the guy for the Rams if Gurley goes down.

How do we know this? I haven’t seen anything solid.