In my infinite stupidity I would place Wharton at RT and move Bell into RG while Kubby heals up. Leaving Bell on the outside scares me and book-ending him with Kalil and Wharton seems the lesser of 2 evils.
If Kugbila returns do you want him replacing Bell or Wharton in week 3?
you rotate kug in while he learns to take the skates off his feet.
i don't like starting rookies on the OL, regardless of what division they played in college or where they were drafted. bring them along slowly. throwing them in the fire might be good for their development, but it could effect the team in a really bad way.
bring kug along slowly this year. use him situationally when he's healthy again (rushing downs) and then go from there.
that's what i'd do, anyway.