Thanks, for the first useful reply, thatactually answers one of the questions I have.
Still, there are 2 more things that I'd like to know:
1. How does weapon skill leveling work?
2. Should I alwys use the 3000 jewels or maybe keep waiting for a specific upcoming gacha event and focus on higher chances for certain "important" Kamis?
The question is not absurd, as at least 2 of the posters here have not done rerolling and stuck to their accounts and did it without early SSRs...
And as you do not know how much time and effort I am willing to put into this game, your judgement is made with very little data in mind.
And to finish it up: next time read, then think, then write, instead of showing that you did one thing, but not the other 2.