They're too expensive potentially and have serious red flags. The problem with signing them is that you continue to put all your eggs in one basket. The result is when anything happens to either of them your depth is seriously hindered. Instead of drafting defensive line talent, you now need to focus that attention else where to make up for the money that you can't spend.
if they didn't have red flags it would be one thing, but you're asking for trouble signing even one of them, let alone both of them.