Just so we are aware on the high rank brachy it is 2 percent chance carve as well as 2 percent chance capture. I am looking at the guide right now it appears that capturing the g rank is a 3 percent capture. So you are indeed better off killing and not capturing.
I was farming brachy with a friend. And i went to make the stage 1 dio SA, and when i looked to see if i had stuff to make the second stage i found i could. I obtained a Gem without even knowing. I was pleasently surprised! --- GT: Cheezepotato