I kind of get it with Barnard, his overall career T20 record is average at best and I think his bowling would be very hittable in that format as he doesn't really have a yorker or any change up deliveries. He did only make 1 score in the the Blast games he did play too.
Benjamin getting the gloves ahead of Burgess is crazy though. Burgess a better batter across formats and clearly a considerably better keeper. Probably a better outfielder too for what it's worth, they have to hide Benjamin at fine leg or third.