Now one theoy is that MD's first kids where the elder gods, before the Tiste Andii, i thought so too untill i read this
Quote
'Even when Darkness ruled alone' Ampelas replied, 'there were elemental forces. Moving unseen until the coming of Light. Bound only to their own laws. It is the nature of Darkness that it but rules itself.'
Now this is from Cotillion's talk with the three dragons chained in shadow. So it seems that the elder gods where always around, just not seen.
What if MD's first born where the pure blood Eleint. Think of it this way,
1: there is just MD and chaos going round in circles.
2: MD gathers a part of chaos and gives it flesh (Tiam), for company.
3: the dragons turn from Darkness and find thier own home, Starvald Demelain (which being the first warren chould be the center of all things)
4: MD lonley again looks inward and makes children of pure Dark, Tiste Andii, and all is good.
5: to keep the balance of things, Light is born and with it the Tiste Liosan.
At this point the Andii get shitty and leave Darkness and that event the need for control over the elements is well needed so come forth the elder gods!
This is my way of looking at things so any questions, arguments, or proof to shoot down my theoy is welcome.