There are 5* that improves their abilitis too. And there might be some 4* to add a second ability even if the common trend is upgrading their ability. Althoug, even upgraded, it's still pretty far from 5* and 6* abilities.

Btw, for the gatchas, i just hit normal when i hit 1000 points, i've yet to see a 4*, but i'm happy when i get decently lucky and get a new 3* to swap for the duplicates in my squad. Or just a manyu, because 8~9 out of 10 pulls are 10x2* D=

Also, i would like to ask what do you think about premium gatcha. ¿Do you hit it when you have the 50 flowers or wait for something? I've read people saying there would be offers or something in the future, so i've been hesitating, as draw rates are not great and i don't know if 2 or even 3 4* would allow me to clear the second part of the event over the 3*, whis is my main concern right now.