Alex Collins Droppable? Standard

I have Sony, Mack, Kamara, Hines, M. Brown, S. Ware
I have secured the number 1 seed and first round bye if he is who should I roster another Handcuff? Burkhead? Another DST?

who are you dst?

I have the Broncos, Washington, Dal I needed to start Dallas to win this week to secure the bye I am dropping Washington for the Lions and Dallas but not sure for who