Lana, Rusev, and Nakamura
One easy solution to the instant tag team division problem that the Shake Up created was featuring the newer (albeit strange) pairing of Rusev and Shinsuke Nakamura on SmackDown. Rusev Day apparently ended when Rusev turned heel once again. It was another missed opportunity for 'the Bulgarian Brute' in a long line of them.
He and Nakamura battled over the United States Title until it was given some stability with Samoa Joe capturing the title. Shortly after they battled over the title, they were paired together as a tag team. But as things played out with WrestleMania and the Superstar Shake Up, they were one of the few remaining tag teams on the blue brand.
The New Day and the Bar had injured members and the Usos went to Raw. Now that Daniel Bryan and Rowan are SmackDown's Tag champs, they should be facing a team from their own show.
Instead, they're being challenged by a team that moved to Raw. Why haven't two former champs been on TV at all post-WrestleMania? And even if she isn't going in the ring, Lana could easily get TV time as the team's manager.
Both men could have at least individually tried to qualify for the men's Money in the Bank match, but alas, the participants were just announced. Reasons like that are why some superstars request their releases from the company.