It's a very good roster flexibility signing. Pocic is familiar. He is playing his best football of his career. And he's quite cheap.
This is an ideal hedge signing. Particularly if Seattle has it's eye on Landon Dickerson who currently won't be available to start the season. Seattle can go either best OG or best OC on the board -- and depending on how the draft unfolds late in the 2nd, has the ability to trade back and try to come away with more than 3 players from this class.
This isn't a knock your socks off signing. But it's potentially one of the smartest moves they've made thus far. But it will quickly degrade to a pretty bad move if we end up not having hedged anything, and instead come away with no OL help. This class is pretty exceptional, but we've been swimming against the tide for the better part of 7 years running now. So there is every possibility, even probability that the hedge is the final result.