I believe the intent to file now was so that they could take over while still in section 6, and negotiate the contract they want to. Not that it will work, and yes it will cost the mechanics money, but it doesn't seem the co was offering much money anyways.
The only, repeat; the only reason the teamsters filed is to induce more card signing over at AA as it comes down to the wire. They have already proven they will do anything (fraud and forgery) to get their numbers up on the cards collected. Don't worry it won't be their last move. They just want you guys at US to believe they are really here for your benefit, when in all actuality they are here for the benefit of themselves over at AA to do anything and everything to stop AMFA, period, no brainer guys...