Chubb, J Brown or KJ in the flex?

Feeling like I need a higher floor from my flex spot this week. Currently have Chubb slated in the flex. Any opinion this matter welcomed and appreciated.

With Gordon out, same situation, not sure if I flex John Brown or Chubb. 2 starting backs are KJ and Murray.

So you’d flex KJ over them both?

I’m starting KJ. M. Gordon is out for me today so it leaves me with Chubb, Murray and John Brown. I’m not sure which other two to play. I have an RB and Flex slot to fill