Interesting stuff here from PFF on Inside LB play last year. Mason Foster was rated as the most productive pass rusher from the Inside LB spot. Martrell Spaight was the most efficient run stopper in the league from this spot. And Zach Vigil was 3rd best in passer rating allowed when targeted.
I think all of those things make sense - Spaight is know as a thumper and Vigil did surprisingly well in coverage last year, he acquitted himself well.
The problem is Spaight may be good against the run but he's a disaster in coverage, and Vigil may have defended the pass well but not well enough to avoid being heavily targeted by QBs.
https://www.profootballfocus.com/new...m_campaign=nfl