Bench Cooper?

Hello community!
I have a flex question for you all to weigh in on. I have a fairly stacked team in my 12 man 1/2 ppr but not sure who to start in my flex. Im starting Brees, Bell, Coleman, McKinnon locked into my lineup, but my WR/TE is making me think about who to start. I have to choose between; Fitz, Cooper, Juju, Witten, and Davis. I can start 2 WR, 1 TE, and W/T. Im thinking about doing Fitz, Juju, Witten and Davis to be safe bcuz of Coopers inconstancy. Am i over thinking this situation?