The reality is that it goes further than just depth. The OL is a great example of not having 5 starter level players to fill out the lineup. Another byproduct of "making it happen", but I'm always reminded that kicking the can doesn't have a cost.
Having young guys at both tackle spots is not the same as not having starting level players. We'll see where we're at, at the end of the season but I think they'll be much better than the Saints have had in several years.