Sony/Graham for Ertz or Kelce

I have Conner, Gordon, Dalvin, Aaron Jones, Nick Chubb and Sony Michel. I also have O.J. Howard and Jimmy Graham. Sony has a tough playoff matchup, Rex coming back and has injury concerns. I’m debating trading Sony/Graham for either Ertz or Kelce to upgrade at TE. Not sure about Kelce if KC still has only 1 loss come week 16 on whether Kelce would be sat down and then crush my playoff hopes. Thoughts?