The parent letter was riddled with so many conditional statements and quid pro quos that a lot of unforeseeable damage could be done to the Pinnacle pilot group without meeting the requirements for SLI.
The prudent action would be to lock it down now, and not wait for conditions to change and then be caught blindsided with a contract that doesn't provide adequate protections to the pilot group.
Scope has already been addressed in TA2. When it's all done (there are 31 sections + parent letter) you are free to tear through it and play devil's advocate. This has always been a concern, and one of the issues that caused the first TA to get shot down was scope and our colgan (shell game) situation.