Very concise, very thourough theories....good job.
I would like to add a new twist into the mix:
As there are no existing red-jade looking remnants anywhere in the jungle (except for the bloodstone), It could be surmised that Paul D'Alessio, in his fever driven delirium, had not actually "discovered" a great Mursaat "city" hidden deep within the jungle. Instead, he may have stumbled across one of the Murssat's teleporters (there are a few examples of these in the Southern Shiverpeaks, One is near Markus in the Iron Mines of Moladune(sp?)), possibly near or around the bloodstone. Paul either accidentally stumbled through, or was carried by some unknown mursaat through the portal to the Murssat homeland possibly far to the north (or south, or west, unknown at this time)of Kryta. This is the best possible theory that I have so far concerning the Paul/Mursaat connection.
Well hotshot, if what you say is correct, then where is the teleporter?
Good question. I feel that the Mursaat do posess the ability to manipulate that red jade-like material. When they had finished establishing the White Mantle in Kryta, they simply moved on taking their "toys" with them, (presently believed to be heavily in the southern shiverpeaks region at the present time due to the presence of the teleporters)
My current interest is in The eye of Janthir....Who is Janthir? Was he an elder god? Are they a long lost race who carved the eyes on the shrines in the jungles? Were they the ancestors of the Mursaat? Will Anet ever release more of the map from the northern parts of the Magumma jungle? IS there a fabled city of the Mursaat north of the jungle?
There are too many spots on the map, as it is, that are covered by the fog of war, Comeon Anet! throw us a bone! Give us more of the story behind these and many other questions.