there are no denominations (which are a schismatic protestant invention).
You seem to like the Roman idea of one mighty heirarchal church. That's not how Christ church was established and that's not how the Orthodox church is organized.
There are bishops with jurisdiction over given areas.
Some orthodox churches have attended the WCC and NCC to lobby protestant anti-Christians to return to Christian ways. ROCOR ain't one of them.
Come on, you have at least two denominations out of the same church. Now that we have established that schisms are not the sole province of "protestants" and it's just a matter of numbers, at least the schisms in the "protestants" are doctrinal, with the separation dealing with fidelity to the gospel, not territorial and political. Here is a popular history of the split between OCA and ROCOR.http://orthodoxwiki.org/ROCOR_and_OCA.
"Some orthodox churches have attended the WCC and NCC"
You are being too generous. They are full members. Our churches vote with their feet when the disagreement is a fundamental spiritual disagreement. We come apart and go our separate ways rather than being seen to agree with an unbiblical position.