I have Luck and Big Ben, waivered Lamar last week. Need Advice!

I really like lamar’s potential, but looking at the matchups, i don’t see myself starting him. I have AB, so I play Big Ben on ideal matchups.

However, should i attempt to drop lamar for someone like:

Gus Edwards? or

Seattle D? Considering I have Minn D at NE week 13 and Seattle home vs SF.

P.s. standard, not dynasty.