Something that caught my attention listening to the Last Minute Blues Podcast with JR is JR made the comment along the lines of "Even if Blues had 10 more points I still think they let go of Bannister and bring in Monty" And to put in perspective. When Blues fired Bannister and Hired Monty they had 19 Points. So adding those extra 10 points would have pout them at 29 and tied for 4th in the league with the Canes.
If so that straight up means even if the Blues were a top 5 team in the league firing on all cylinders Blues still would have let go of Bannister to pick up Monty who they wanted all along.
Also Sounds like Claude Julian is done head coaching (per his interactions with JR). He wants to stay in the NHL, but he doesn't want to HC job and is happy with being Assistant Coach.