Cause of ascian calamity and rejoining elemental

[Ventura_Highway]

Just wondering, for all the rejoining with a specific element, were those element tilted toward ulbral/ Astral or balanced?
And also, do they have to be different? I dont see why they couldn't cause 2 water calamity

I think they could theoretically but it would be harder. If they need to cause 13 rejoinings they'd have to.

If I remember G'raha's lecture right aether is sort of like a gas in that it likes to go from places of higher concentration to places of lower concentration, calamities from an aetheric perspective involve a shard's aether totally flooding into the source. So, if we have a water calamity than ends with say, Shard 10's largely water-aspected aether being totally relocated onto the source, wouldn't it be hard to usher in a consecutive water-aspected calamity?