Without being too confident, I think he is in Moscow, given all the evidence save for the fact that no third source has actually seen him there.
It makes great sense he did not take the flight to Cuba he was expected to go on; I think he will take a flight suddenly and unexpected and to a country we did not consider. To avoid any presence of other nationals[0] and journalists on the flight.
This will his plan all the way to his final destination. He might even at times move through means we did not consider (e.g. by train or car; under diplomatic protection, of course).
Could it be possible that he requested asylum in Ecuador after in arriving in Moscow because he is trying to get them to transport him from Russia to Ecuador privately?
Possibly. It has been stated numerous times that he has advisers from Wikileaks on the plane, and they may have suggested this solution. I am confident that they also suggested him not to take the flight he was scheduled for.
It makes great sense he did not take the flight to Cuba he was expected to go on; I think he will take a flight suddenly and unexpected and to a country we did not consider. To avoid any presence of other nationals[0] and journalists on the flight.
This will his plan all the way to his final destination. He might even at times move through means we did not consider (e.g. by train or car; under diplomatic protection, of course).
[0] In particularly American officials.