Drop R Harper for T Mays?

I am not sure how serious Harper's hamstring injury is, but somehow tempted to add Mays as my league is keeper league. I can start 2 safeties. Other than Harper, I do have TJ Ward and D Whitner. Since I have two good safeties, is it ok to invest on Mays by giving up Harper? Or is Harper too talented to give up in spite of his injury. My concern is that hamstring is not going away easily and could affect his entire season. Other than Mays, Huff and Ndukwe is also available , but I like Mays a lot and his potential in the future.

Since you already have two fairly good fantasy safeties and since this is a dynasty league, I would definitely go after Mays. Harper is solid but doesn't have much big play potential and I have a feeling he's going to struggle with that hamstring injury for a few games.