12th year Keeper League, stumped... Help?

I’m torn on if I should keep Evan Engram for a 7th, of if I should keep Alexander Mattison for an 11th? Who knows what will happen with Engram, but Mattison could have an expanded role, and now that contract talks have stopped with Dalvin Cook, Mattison might be a hell of a steal in the 9th round as a 2021 keeper… thoughts?