Looking at this guy's history it doesn't seem that he will exactly filling holes
As of right now, we don't have a capable backup tackle. So signing this guy would fill a hole. Same with the Vickerson signing - it filled the hole created by Kenrick Ellis signing with the Giants.
Hilliard was one of the better pass protectors in the NFL in 2013. Nothing wrong with adding veterans with one year deals. It provides great competition for younger players.