"UNITY" is just a word printed across Charlie Murphy's forehead.

The intent is quite clear:

"For a period of five years, beginning with the submission of
the integrated seniority list, no pre-merger Pinnacle or
Colgan pilot may be awarded or displaced to a CRJ-200
captain position unless Mesaba pilots maintain 100 CRJ-200
captain positions and no pre-merger Mesaba or Colgan pilot
may be awarded or displaced to a CRJ-200 captain position
unless Pinnacle pilots maintain 541 CRJ-200 captain
positions."

If taken at face value, this will mean 9L and XJ Captains will be downgraded while quite a few 9E maintain their seats. It's hard to sympathize though, considering the most junior original 9E Captains are all 2006 DOH while both XJ and 9L have plenty of Captains hired in 2007 and Colgan even has a couple hired 2008. These 2007/8 9L and XJ pilots need to be downgraded first before 9E pilots. If a quota can't be maintained 100 XJ and 541 9E, then other 9L need to be flushed out.

To answer your question, 9L and XJ reps will still represent their own pre-merger pilot group and try and save their left seats as long as possible.