The Pats have had more luck with undrafted folks such as Connelly and Wendell -- not much with late round OL picks. Last year though both their late round OLmen were cut but ended up making the full squads of other teams.
Sounds right to me. When Cannon is cleared ( he claims he'll be ready for the first day of camp ), Mankins & Connolly are the day one starters with Wendell and Cannon ( as he recovers ) the backups. Not sure how Ohrnberger makes this squad.
This is even assuming that the Pats don't bring in a free agent or another undrafted free agent as well.