Nick Underhill’s concern with Saints O-Line might be “heightened”

I think we’d be Ok with Hurst as LT and Penning @ guard. I know that’s not his future, but I like the idea of having elite guards to keep the inner pocket clean. Penning didn’t play at all last year, and no one was constantly complaining about hurst getting beat giving up sacks etc. Penning seems like the type that learns by doing, ie reps. I do believe that once he learns his position inside and out, he’ll be fixture for the next decade.
No way. Hurst is barely serviceable at LT last season. Penning will get better as he continues to get snaps. Literally every rookie LT on his class struggled during the first half of the season and eventually got better. Penning is essentially a rookie and will continue to get better and better with every game under his belt. You don't hinder his development and experience for a minimal gain in the short term. Let him take him lumps early on and get him ready for December, January, and possibly February.