Absolutely not! MTBA are an independant association who are affiliated with CA, but we most certainly do not report to CA. You are probably thinking of the federated structure both CA and BMX run under, where it's closer to say that the state federations - eg, CQ, CV, CNSW - report to CA. BMXA have similar, BMXQ, BMXV etc reporting to BMXA - they too are independant, but simply affiliated with CA.
In terms of "some rounds are ... MTBAs", think of it in the same way that round 3 (the Wombat 100) belongs to MaxAdventure, maybe to a lesser extent - we simply ran the first one because to have MTBA staff completely swap out and then hand over to would have operationally been difficult, so all the commissaires, media, registration etc people were retained and it kept uniform.
Get me some details of the queries you asked, and where you sent it, and I'll either get you some answers, or fine someone who can.
Regarding the six weeks - there's no exaggerating there. Up until that point, start of December, CA were responsible for delivery - eg, hiring contracters, infrastructure etc. They handed over everything they had done to that point: Arranging a club and venue to help out. That's it. That's all had been done. Permits, equipment hire, transport, medals, staff and commissaires, medical, you name it, Una and Shane frantically did everything in that time bracket to run the event to the standard, which frankly I think wasn't bad at all. Yet you're saying MTBA "[couldn't] organize a root in a brothel". After Adelaide it was all hands on Buller. There really is no exaggeration with the six weeks notice, because MTBA had contracted CA to deliver the event, and that understanding was still in place until that time, where you will see press releases stating as such.