#1 A WrestleMania match

This is, again, one of the more obvious reasons. While our first point indicated at a possible Saudi Arabia match, we wouldn't be surprised to see this as the direction for WrestleMania 36.
We're a bit surprised that they teased the match this early rather than in late February. It brings the question as to whether Edge will be appearing week-in and week-out, every alternate week or on an irregular basis. We'll surely be seeing him a lot more in March, but that could also mean a relative absence in all of February.
Insane Vince McMahon ideas that got canceled - Watch Here!
It makes sense that WWE would want to do the match at WrestleMania. They need marquee names and this one is big enough that they don't even need a title involved to sell it.
On that note, we don't hate the idea of this as a WrestleMania match, even if we would rather see Edge go up against someone he hasn't faced before like AJ Styles.
Also read: 5 reasons why Edge returned to WWE at Royal Rumble 2020