Safety in the whole scheme of things is a low value position. Compare the pay of top safeties vs other defensive positions and especially compare it to offensive stars. A safety is the equivalent of a RB almost why draft in the first round.
I know the OP is throwing ideas. But a safety sliding is not too surprising. Picking one high in the first carries a big contract in relation to importance on team.
Better to use those kind of picks on O LINE QB CB WR LB and Edge Rusher. Where you get max prodution on a cheap contract in a position scarce with talent