Originally Posted by Drip

Shine Crystal drop rate is definitely of the A+B version. At least, at the start of combat, my squad with Cactace, Peach and Strawberry Candle shows "Shine drop rate 50% increased" for all members.
Moonvine + Tachibana also results in a 2.4 (A+B) skill activation rate notification on the third turn.

However, there IS something different about the effect Geranium and Cyrtanthus have: they're affected by the affection statistic. So that might be either a bug or intentional, that the second effect of the two simply overwrites the first. This is definitely something worth investigating. Still leveling Cyrtanthus here, and she hasn't even evolved yet, so it might take me till next weekend before I can really look into it.

Interesting. Well lets wait until you evolved Cyrtanthus and together we will solve the mystery of Skill Activation
Sadly i am not a big Helper in this on. The only Girl i received with this Skill is Cyrtanthus
But potentially 6* Teams with Damage Reduction or Skill Activation+ should be the strongest Teams in the end...

I mean if the Affection Based Skill Activation Passives are A*B*C*D*E we would get a Skill Activation Bonus of 2,49.
That means Dianthus for example would have an Activation Rate of her Battle Skill from 59,76 % and that's nasty...