So maybe - just maybe - the coaches have a better idea if Hager is the backup for MLB they want longterm, than fans do - since we've only seen him playing MLB against 3rd stringers and the like in preseason. He might be - or maybe the coaches feel that another option is needed.
In fact, based on their pick, I'd say that was likely what they feel, while they apparently felt that the safeties actually available when they picked weren't what they wanted - at least not as much as other options.
I doubt if ANY of the safeties do as well as McLeod - but Fisher isn't a miracle worker, and trying to find a rookie after 200 picks who would do as well as McLeod first year is unlikely. But don't worry - this is a Fisher team. Next year they will go back to drafting DBs.