Do universe 6 saiyans transform more easily than universe 7 saiyans? So far we've seen 3 saiyans from universe 6 with an important role in Dragon Ball Super. In a short period of time, less than 48 hours for Kale and Caulifla if I recall correctly, and less than a year for Kyabe, they've mastered more than one transformation. Kale mastered super saiyan berserker and super saiyan green, Caulifla mastered super saiyan , ultra super saiyan (not sure if this is a state or transformation) which chances to master super saiyan 3 in the tournament according to Goku, and Kyabe mastered super saiyan and super saiyan . Why is so? Do universe 6 saiyans transform naturaly more easily than universe 7 saiyans or is there another reason?
Officially the original super saiyan transformation was triggered by pure anger and enough raw power to transform. The only possible explanation this is that U6 saiyan have the power but they are not that interested in fighting so they never really explored their power.

One more thing that you can't expect a story to be perfect and with no plot armor because the mangaka has to make the story interesting.