#2. Bo Dallas & Curtis Axel

Bo Dallas was one of the earliest NXT Champions and a 'main event' player on that brand and Curtis Axel was a Paul Heyman guy and chalked up victories over Triple H, Chris Jericho and John Cena.
Then they sort of stopped being important on the main roster, until they were able to organically get themselves over as a tag-team called 'The B Team' and they even managed to capture tag-team gold.
But the last time this tag-team wrestled together was October 2019 at WWE Crown Jewel, and since then, Curtis Axel has only wrestled once on a SmackDown dark match and Bo Dallas hasn't wrestled at all.
To be slightly fair to WWE, the SmackDown tag-team division is fairly crowded with Heavy Machinery, Lucha House Party, Miz and Morrison, The Usos, The Revival and New Day so someone's going to be left out.
With that in mind, it doesn't look like we'll be seeing Bo Dallas or Curtis Axel anytime soon and I'd be surprised if we see them before WrestleMania at all.
Becky Lynch has been challenged HERE.