With the Patriots adding Ratliff to the practice squad, it means that the team will now have three arms in practice, as well as their new scout team quarterback. Ratliff, 6'4" 224 lbs, has spent time under Eric Mangini with the Jets and Browns.
The Ojinaka move doesn't necessarily mean that the team won't make a trade for Deion Branch or make some other move. The team doesn't play for a week and a half and the move is simply for practice. Ojinaka could stick around, but probably won't see any game action soon, barring injury.