There are WARs out there who won't turn off Deliverance... but at the same time, whoever said you should turn off Grit is right. You can't really be sitting around in your tank stance when a swap needs to happen. Considering how lightly the boss taps you when you have 0 stacks (and considering how late in that phase you actually need to swap), it's better for the OT to just stay in Deliverance, the MT drop their tank stance, and then proceed from there. Most groups swap at 4~5, so around that point you'd want to drop Grit and pop a small CD to ensure you can survive until the swap happens.