Who will complete the SmackDown Tag Team squad?

It's hard to imagine the SmackDown Tag Team division without The Usos and The New Day. Last week, they went to war with captaincy on the line and like on many different occasions, The Usos proved to be the better team.
However, the Samoan brothers paid respect to The New Day after the match, acknowledging the fact that many a time, they've both been to hell and back. As a token of respect, they told The New Day that they were the first recruits in the tag team squad for SmackDown Live.
Now three teams are left to be added and it's going to be really interesting to see who gets the remaining spots. Sanity should be a no-brainer for this one. With that being said, it's not unbias to say that SmackDown Live has a far superior tag team division.
Even if you look at the RAW team, it's quite obvious that they're lacking in depth. It's a must-win for SmackDown Live and frankly speaking, it should be an easy one.