#2. Zelina Vega and Aleister Black

This is one of the rare entries where we've seen the couple against each other but not with each other on-screen. Zelina Vega's role in NXT and the main roster has been that of Andrade's 'business associate'. She proved to be vital in his early success due to the Mexican star's weakness in English promos.
She remains in that role, with Angel Garza being added to her list of clients. As for Aleister Black, he remains on the same brand (which is no coincidence, as WWE ensures that couples are on the same brand regardless of their on-screen roles) and is carving his path as a future top star in WWE.
For many, Black and Vega should never be on-screen together and given the difference in their characters, it wouldn't make much sense to align them together at any time. If anything, Aleister Black is the type of character who should remain solo throughout his career. He's best as a 'lone wolf', while Vega is a perfect fit for her current role.