Interesting. This actually should lead to some interesting connections with the ethnology of the Eastern Woodland tribes.
The Iroquoian tribes seem to have borrowed a few elements from the Southeastern Ceremonial Complex. Read the accounts of the 1600s and you see that they were very ceremonial about their torture and cannibalizing of enemies—generally doing so on a platform and making an effort to keep the victim alive until dawn, perhaps as a sacrifice to the sun.
There definitely seems to be some religious thread that is underlying the whole Southeastern Ceremonial Complex.