#3 Jericho's outside commitments
Credit should rightfully be given to Chris Jericho, as he has been a regular feature each week on AEW TV. 'Le Champion' and his Inner Circle have been running roughshod over the AEW roster ever since Dynamite debuted in September.
When Jericho announced he was joining the company early this year, I envisioned him being a part time performer in the same way Brock Lesnar is in WWE. While this hasn't been the case, other outside commitments could start effecting Jericho's championship run. His band Fozzy have a couple of concerts lined up for 2020, which in the past, has seen him take time off from wrestling to prepare.
New Champs in WWE! More RIGHT HERE
Another circumstance a bit closer to home is a match he has scheduled for January: a clash with Hiroshi Tanahashi at Wrestle Kingdom 14. While we don't know what New Japan's plans are yet for this match, there is a realistic possibility that Jericho could lose.
It has been well documented that the relationship between AEW and NJPW isn't great. If that is indeed the case, there is no way that The Elite will let their world champion lose at a rival's biggest show of the year. One way around that would be for Jericho to drop the championship in the two months before Wrestle Kingdom, and Full Gear is the biggest stage within that time period to do so.