On DeVree: I think he is the fifth, not fourth TE.
At top three, some order of Baker, Smith, and Watson.
Then you have David Thomas, who has athleticism and talent, but hasn't produced well at all so far.
Then DeVree.
At OL, after Wendell, you have:
Al Johnson - veteran center, former starter, fairly likely to be given a look to see if the Pats could use an interior OL back-up who is a center first, guard second, rather than the reverse
Wesley Britt - looked good in his first season, then horrible last year, but has a couple years on the roster, some experience
Billy Yates - famous for being the highest-paid practice squad guy in history, I believe, so the Pats could keep him around and develop him. He started while Neal was out last year, and was ineffective - but he has been a starter here
Ryan O'Callaghan - behind Kaczur on the depth chart, and now Vollmer as well, but also has some starting experience and coming back from injury.
Mark LeVoir - played well as a back-up last year
Could easily see one of these, in addition to Wendell, but each can make a decent case. If I had to guess, I'd probably go with Britt, given the depth with LeVoir, O'Callaghan, and Vollmer.
Obviously easier for the team to use Military Reserve if that's appropriate.