I will be departing through NRT T2 for the first time next month, and have a few questions. I will be on CX527 STD 14:45, travelling with another friend, me holding CX Gold.

1) I understand that CX counters open from 06:55-10:00 and 11:45-17:50, will I be able to check-in for my flight during the period of 06:55-10:00, or must I wait until 11:45?
2) Is fast track security/immigration available for Sapphire? And only for myself, or can I bring my companion to use it as well?
3) Is it possible to lounge hop between lounges in the main T2 building and the T2 Satellite, or cannot return to main building from Satellite like the situation in ICN T1 and T1 Satellite, where the train only goes one-way?