Underhill article: “Saints moves are telling us what they felt the real problem with the team was last season”

Depth and guys who can play multiple positions are needed for any system, as there are only so many roster spots. Again, this is ultimately a FO (talent) and coaching( making the most of said talent). My position is not so much that injuries are irrelevant, just that good organizations can overcome injuries and retain a level of completeness.
IMO, KKs system is highly likely that the backups will have significant platying time. Unlike our previous system that just required an Olineman to hold up a few seconds pass blocking.