I'd normally be very much opposed to Scott Barrett playing at 6. But it could work for the Crusaders in 2020. Our backrow stocks are so depleted that there isn't anyone who can legitimately lay claim to the no.6 jersey. Ethan Blackadder has been around the squad for a while but is injured, and poor Tom Sanders has hardly set Super Rugby alight thus far during his injury plagued career.
Given we have reasonable depth at lock, with Romano, Dunshea and Strange all quality players at this level, it might just be that getting our best XV on the field means switching Barrett to 6. Other positives include it being potentially easier to captain the team from the side of the scrum than in the engine room, Scott Barrett being a decent ball runner which would balance our backrow and the fact that he's generally been a better lifter than target at lineout time.
Anyway, it's all food for thought. We have more experience and quality at lock than any other position and moving Barrett to blindside might just sure up what will be an extremely green backrow.