the vinegar or bleach bath will remove the surface layer of the rock effectively cleaning the surface of dead and unwanted organisms and neutralizes the bleach.
Even though it is dry that doesn't mean it is dead, some organisms are just laying dormant waiting for the water to return, I've read that aiptasia can lay dormant for years, after bleaching, the rock will be dead and will have to be cycled and repopulated with bacteria before it will be effective as live rock, this is best done in a container without light, if you introduce it into as system without cooking it it will be vulnerable to algae, cyano, diatoms, etc.
It would probably be ok to sump it but I wouldn't put it straight into a display tank.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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