Is it possible that the one thing that is different in every kalpa is the addition of a new spoke on the wheel? In the previous kalpa, there were Eight, and in this kalpa, there are Nine?
I can't sleep, and had this idea as I laid there, trying to get to sleep.
I think you have landed on one of those things that has no Lore either way. So there might be one less Spoke too.
Just as Gods may be mantled so it does appear that the Towers and the Spokes correspond - but I've not come accross anything that might suggest that creating a New Tower also creates a New Spoke for example - rather Towers seem to have been created to match existing Towers. If this is incorrect you might ask if a Tower 'loses' it's heart does it cease to be a Tower and therefore does the corresponding spoke cease to be a spoke?
But whether there is a shape or progression associated with the many Kalpas is an interesting topic. Now that I look closer at your question I wonder if you are asking if Kalpas and Spokes correspond too?
Speculation based on your suggestion would then be: If you assume that Time is the Hub then each Kalpa might be a Spoke and all contained within the Mundus suffounded by the Aurbis. To see it this way may be to accept that the Wheel is multi-aspected and that there is a progression.
Then you would have to ask if growth within the Wheel is possible - considering that 'all time' is considered to be bound within the Wheell, thereby binding all within the Wheel to it.
If internal growth exists then that might be represented by the appearence of a New Spoke/Kalpa and thus although the Wheel is circular there is also change and growth.
No idea if that is a new way of looking at it so that should be enough to give the buffs something to refute or otherwise play with.
What then interests me is: what external force is the hub of the wheel powering or being powered by?
And you also have a 3 tiered progression: Tower ... Spoke ... Kalpa
An alternate structure would be if Kalpas are the Spaces Between the Spokes. And if not, what do the Spaces represent or correspond to?