#2 Nobody remains loyal when there's a title involved
Speaking from the kayfabe perspective, stars in WWE rarely remain loyal to their partners. Even the greatest of Superstars have betrayed their partners to win the gold. One popular example of this is R-Truth and Carmella.
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In most of R-Truth's 24/7 Championship reign, Carmella helped him retain it from other Superstars. But in the end, it was she who betrayed Truth for the title. While some fans knew it was coming, we were surprised when it occurred.
The same thing goes for Sasha Banks. Her best-friend, Bayley, has the SmackDown Women's Championship. She is most vulnerable to Banks as she has been with her for a long time now. She knows how to defeat her and she has a better chance of making that happen.
Moreover, the two Superstars share a long history and have already put up incredible matches in the past. Banks has been without a title for quite some time and this might be the opportunity that she was waiting for.
Did a WWE Hall of Famer predict John Cena's heelish ways long ago? More details HERE.