1) Why do we believe that Munford is anywhere as good as Lowe?
2) If Munford is almost as good as Lowe, why do we think that he would be an easy free agent signing for us?
3) After all, it is simply a matter of price. The market will decide the value of free agent starters, backups at LT or RT only, and the value of swing OT's who can step right in and contribute. And yes, there is even value in the #4 OT position if a team chooses.
4) I don't know what the alternatives will be in free agency, how many other teams are competing, and what it will cost to get our backup LT. As we see now, it is indeed important to have a backup who can contribute.
5) Finally, I do NOT want to count on a rookie to be our backup LT. I prefer a veteran swing backup and then perhaps a draftee, although we have no real need at LT if we have a OK veteran backup (as was the case for this season).