If you have 5 cameras running, you have no need for the ‘swap cam bank’ function. You should only be seeing 5 cameras at any given time.
After doing the whole add edit/subclip/add aux TC, are you sorting the clips by aux tc then name? If you’d like “Cam A” to always be in the same spot, and “Cam B” to always be in the same spot (on the 9 split), you need to do this. Again, I do not see why you would need more than 5 spots in the 9 split.