The following comes from ROHWrestling.com:
"Earlier this evening, with heavy hearts, Ring of Honor officials accepted the resignation of ROH Matchmaker Nigel McGuinness.
Speculation surrounding McGuinness’ sudden resignation has begun to boil among ROH officials. While some chastised his leniency toward Bullet Club’s behavior in the summer, others believe that now McGuinness may be under extreme duress from Bullet Club’s Adam Cole for changing the stipulations of the Final Battle main event just days in advance.
One of ROH’s all-time greats, the former ROH World Champion has resigned. ROH management has announced it is forming an executive committee to oversee matchmaking in ROH. We wish Nigel McGuinness the best of luck in his future."
At this time, it's unclear if this is simply a storyline or if Nigel McGuinness is legitimately done with ROH. We'll keep you posted as more information becomes available.