Whats mosterts value ros/trade for?

Half ppr
I was able to grab Mckinnon off waivers

The mostert owner has only Jones and Breida as his two backs currently and theres not much on waivers now

Would something like Mostert and Andrews for Ertz, Singletary, and Mckinnon be something that seems reasonable or would i need to add more i just dont know mosterts value now?

My team
Cam
Ceh, Robinson, Singletary, Mckinnon
Adams, Ridley, Lamb, D. Johnson,
Ertz, Hurst

His team
Mahomes
Jones, Mostert, Breida
Lockett, Diggs, M. Jones.
andrews, Rudolph

Hes 2-0 but doesnt seems to be making waiver moves much extra defense and qb on his team

Bump for any of those mostert owners out there.