Robert Schmitz said on Twitter that he thinks Braxton wouldn't be any good at G because he has a tendency to get overpowered. So there's really only 1.5 spots on the line that are filled if you're set on replacing him and both guards (which i agree with).
A pass rushing Edge is by far the biggest defensive need. If Billings can come.back and play at a similar level then the front should be at least league average if adding someone who can get pressure on the QB, and that makes the back end better by default.
I feel like the best path at this point is LT in the 1st, followed an iOL and an Edge in the 2nd (all after signing 1-2 iOL and an Edge in FA). Would like a starting CB in FA too. Stephenson can't go into next season as an unquestioned starter.