interesting take on the events Karl ...i guess the more i read the
picture will become clearer.I summise even with or without the
Conquistadors the Aztec Empire was starting to crumble...!
with the vast array of enemies and "partially subjected" tribes
all around them im suprised they lasted so long. man to man
were they better warriors?...........or just the the Eagle/Jaguar/Hustec
(spelling) were the driving force........../.

In the info I sent on those draft rules, my iniital thoughts are that they were a strong federation, certainly their structure of the military made for a formidable army, the shock and awe element such as the flower war or threat of this is very much apparent as a deterrant for tribute smaller nations, city states. If you look at the Aztec Alliance it was most liklely a combination of the above and also the size of the force together with their cohesion
THE TRIPLE ALLIANCE ARMY
A Triple Alliance Army consists of any number of Xiquipillis, a Xiquipilli in turn formed from three or four Calpulli. To call out an army for the Triple Alliance the first contingents were drawn from Tenochtitlan, Texcoco and Tlacopan, with Tenochtitlan being the military leader of the other two and provider of the commanding general.
The Army structure is conjecture and has been devised to present a “feel” for the differing traits of Mesoamerican warfare. A Triple Alliance army is biased towards Line troops, representing a main field army and its Elite Military Orders. Missile troops are drawn exclusively from the Allied Tribute towns. The Xiquipilli structure represents a field army, . This can be substituted for any Elite order to act as a bodyguard if required. If fielding more than one Capulli or if depicting a campaign army, Line Capulli can be substituted for Allied Tribute Capullis as required, with the exception of the Elite Capulli.
Additionally, Line units can be substituted for either Priest or Pochteca units at either Xiquipilli, or Capulli for Priests, or Capulli for Pochteca. Additionally if a Priest Xiquipilli is fielded then the Elite Capulli can either be priest Elite units or regular Military Orders.
The following Capullis would have been the most common to have provided warriors for any campaign
1. Tlacochcalca, Cihuatecpan, Huitznahuac, Tlacatecpan, Yopico, Tezcacoac, Tlamatzinco, Molloco Itlillan, Chalmeca, Tzonmolco, Coatlan, Chillilico, Izquitlan, Milnahuac , Coatl Xoxouhcan
1. Texcoco was essentially split into two halves ruled by Ixtlilxochitl to the north and Cacamatzin to the south. So the army may have a Capulli form each Chiefs subjects
2. Tlacopan (Tacuba) was weaker and as such was merely an extension of Tenochtitlan so providing 1 Capulli for an army.
Allied Tribute Army
These were from a multitude of areas within the Empire and were called upon as local forces perhaps to support the Triple Alliance Field Armies or used for local duties such as garrisoning frontiers or collecting tribute etc. When fielded they will be lead by a Tlacochcalcatl or Tlacetecatl who was commonly an Aztec governor sent from Tenochtitlan. When acting in there own defence they are lead by their own Tlatoani (Chieftain). In general due to their dependency of missile troops Allied Tribute Capulli are found in support roles within Triple Alliance Xiquipilli. An Allied Tribute Xiquipilli can field an army in its own right.
This variation on the Capulli is similarly, most civilizations had suit wearers but not in such great proportions as the Triple Alliance.
This army structure represents a regional army, being weaker in Line and Military orders but heavy in light Missile units, based upon the fact that many Allies cultures were more in favour of the bow /sling than the Aztecs. As opposed to the Main Field armies these Capulli represent the forces available to the tribute states and are indicative of the smaller armies fielded against the Spanish whilst subduing the lowlands. As indicated within the Triple Alliance structure these Capullis are interchangeable with the Triple Alliance Capullis when representing a more regional or campaign army. When operating in a particular theatre of war, the local tribute towns would be required to provide troops or possibly supplies. They would be looked upon as an allied general and contingent, Regular Military Tributary Contingents were
The Four Lords of Colhuacan
Xochimilco (who held a special and senior role as a military ally)
Cuitlahuac
Mizquic
Combined peoples of the Tierra Caliente
Chalco
Cuauhtlalpan