Don't know for sure but my guess is they want to gather more information about him - how does he compare with practice squader Sampson Genus? If one of the interior OL go down and Dietrich-Smith has to start and Genus is (perhaps) added to the active roster, which interior OL is next in line for the practice squad? This is an ongoing and active process that Ron Wolf really emphasized and Thompson has continued - the more info they have on all the players in and out of the league, the better.