First, furlough order of new hires (the third list) is not spelled out in the TA. However, because they are junior to those on the East & West lists, it's implied that they are furloughed first because that's what the underlying contracts specify - furlough in inverse order of seniority.
Section II (A) specifies that two separate pilot groups, each with their own contract, exist until Operational Pilot Integration occurs (Section VI (A), referenced in II ( A ), covers the Operational Pilot Integration).
Two groups, each with their own contract - when was the last time you got to vote on (or had the MEC ratify as your elected representative) the replacement of a contract that you don't work under? Voted on any Express contracts - separate pilot group with separate contract. Same thing here - East gets to decide if the new contract replaces the current East contract and West gets to decide if the new contract replaces the current West contract. Heck, USAPA (like ALPA) doesn't even let every member subject to a contract vote on it's replacement - apprentice and inactive members are prime examples. Why should you (or anyone else) get to vote on replacing a contract that you're (or they're) not even subject to.
Jim