For flex plays, i usually think of the running back is the safest play. For that choose Kareem Hunt.
Tyreek Hill and Martavis Bryant have higher upsides.
The question for Hunt and Hill is that you never know how Belichek will play the Chiefs. He has the reputation of taking away one player at the expense of other players. Hill is no longer a wild card on the team, he'll be a focal point. How will he handle that?
Martavis Bryant should see matchups with Cleveland's second corner, because Antonio Brown should get most of the defense's attention. And now it seems the Browns may be without Myles Garrett.
For this reason, I would go with Bryant.
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