#1 Rusev and Lana

Rusev has been one of the most underutilized WWE Superstars of the current era. He started strong with an undefeated streak that was ended by John Cena.
Things only went downhill from then although he experienced a resurgence thanks to the popularity of Rusev Day.
However, WWE did not embrace Rusev's popularity and pushed him to the moon like they should have and just turned him heel.
While Lana is not as much of an accomplished singles star as Rusev, she has not been given a chance to improve as she barely wrestles.
Lana has only competed in two matches this year so far. While she is no Charlotte Flair or Asuka, she has shown improvement when given a chance to do so.
Neither of these superstars has appeared on WWE television in weeks due to Rusev requesting a leave of absence due to booking frustrations. The contract of the Bulgarian Brute is set to expire, and Lana will likely follow him wherever he goes.
AEW will undoubtedly want to sign a superstar like Rusev as he would be their most high profile signing since the signing of Jon Moxley and he is incredibly talented due to his charisma, mic skills, and in-ring ability.
Rusev and Lana are also incredibly popular as a duo, and the company would benefit from having more husband/wife duos beside Cody and Brandi Rhodes.