#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.
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