The Potara Fusion has thrown a big impact in the Tournament of Power. Even the other Gods of Destruction with their Gods of Creations, will going to consider lending Potara Earrings to their warriors. Kefla’s power is undeniably great, as she caught Goku off-guard in basically his fastest form with her speed. That actually says a lot about Kefla.
Kefla is at least faster than Gods of Destruction can follow, and basically the two Zenos. Remember Dyspo? Goku on his Super Saiyan God form can somehow battle him. But you can’t describe the shock on Goku’s face when Kefla tried to attack him. It means that basically, Kefla is the fastest being right now in the Tournament of Power (when you exclude Jiren and UI Goku).
But even though Kefla is one of the most amazing warrior right now in the Tournament of Power, she is also one of the riskiest gamble that Universe 6 took. I might say that Kefla one of their biggest mistake so far, the first being Dr. Rota which only became a mere casualty for them.
Kefla, which came from Kale and Caulifla, is only one being because she came from the Potara Fusion. In the moment that Kale and Caulifla fused, one of them was eliminated. Therefore, Universe 6 only has three warriors. Kale and Caulifla is still in the Tournament, but when Kefla fell out of the ring, they will both be eliminated.
And one thing that makes Universe 6 vulnerable is Kefla’s power. Potara fusion brings new and stronger warriors, in a sense that their power will become uncontrollable. Kefla has shown that she cannot still control her tremendous power. This is the reason why the Potara Fusion will be undone in a quicker time, Kale and Caulifla will be diffused earlier than expected.
And not only that, when somehow managed to stay in the tournament after diffusing, they will be out of stamina. They can’t rest and fight like before because in the Tournament of Power, time is one of your enemy. It was already half-over and you can’t really rest in that time to fight enemies like Jiren or Goku, assuming that Goku wouldn’t get eliminated first.