Bortles and Mariota- Fantasy nightmares

So I have these two as my starters in my two Dynasty leagues. What do I do with them? Seems like Bortles is getting the bench now, so maybe pick up weak armed Kessler? There’s no QBs available in my leagues except back upstairs sometimes. I have Osweiler now in both! Will I ever be able to trust Mariota? He actually has a decent game every time I bench him, but when I play him he scores 5. I feel like I gotta drop this land mine. What do I do??