I think that Todd Washington definitely makes the team as he is a solid center/guard back-up who played surprisingly well at times last year and is definitely not dominant but is a good back-up.
Fred Weary provides youth/potential as another cener/guard back-up.
Milford Brown is probably the best back-up guard and also provides youth and potential.
At the back-up spots for the tackle position, we have the newly added Spears along with our two starting guards able to move outside. IMO, that is why the Texans will keep mostly guards as back-ups (also better special teamers) and the nice mixture of veterans and youth.
I also noticed in the bio of Spears that he received high marks in the character department, which is pleasing, and I also like the fact that he has blocked for Priest Holmes for the last few years and perhaps he can give DD some insight or extra confidence. DD is built just like Priest and will come out even stronger this year behind our improved o-line.
IMO, this is how our opening day roster will read in regards to o-line.