Delanie Walker/David Mopportunity for Ertz/Mostert

Hey footclan, new member to the foot and I’m hoping to get some feedback on a trade that’s brewing for my team:

Give: Walker/Montgomery
Receive: Ertz/Mostert

I currently have James Connor, Singletary, and Gore as a handcuff. My worry is handing over a (unpredictable) starter in Montgomery for another backup or 3rd string of Coleman returns after the bye. Any thoughts would be great. Thanks!

Also it’s .5 PPR