The Niners and Cowboys wanted Vaccaro badly

I agree they were probably after one of the tackles. The article the OP linked to specifically mentioned finding Justin Smith's eventual replacement.

As for who SF had rated higher, KV or Reid, it could go either way. The absolute consensus among all draft experts was Vaccaro as the best safety. No one disagreed. I think the Cowgirls had him rated higher.Both safeties are physically talented but KV is more consistent. Reid will leave you scratching your head sometimes.

That said, you never know how a TEAM has the players slotted. Every year there are surprise picks b/c teams thing they know something about a player no one else does. Maybe Harbaugh really has a man-crush on Reid. Still doesn't automatically mean Reid is better.