That's why I'd move Fuaga to RT if we get a better LT in the draft. I know Penning has developed, but he's still suspect as a pass blocker and needs a lot of help in pass protection which limits what you can do on offense. I think he's fine, but if you want a great OL, you need to upgrade Penning, Ruiz, and the LG spot. At the same point, if Ruiz is your weakest link they you still have a very good OL compared to the rest of the NFL.
And, if we change scheme, Penning's run blocking might not be as important as his liability in pass protection especially when put on an island one on one. And, if we change coaching staffs, I'm not sure how Penning will react without Benton and Dennison. I think a lot of his issues are mental and I think he's pretty fragile in that regard given how concerned they are about his confidence all the time. Which is also why I would find it hard to give him the big deal it could take the keep him past the next couple years.
Anyway, Will Campbell is likely the best LT in this draft and given how he played this year at LSU I'm not sure he's going to be good value where the Saints are likely to pick so it may all be moot anyway.