Board Thread:Questions and Answers/@comment-33867385-20180124112552/@comment-32233739-20180124114830

1 - SA stands for super attack yes.... SA15 is for super strike characters and (on JP) characters that have an Extreme Z-Awakening... SA20 is for LR cards

2 - the cards need to be exactly identical, not just in name of the person, but the name of the card in order to raise node... its why its called a dupe... as in duplicate of the card you want to open a path on.... also, it can only be done when a card is at UR (you can use a SSR to open the node of a UR as long as its the same card).... not all cards are worth opening nodes... and with regards to the vegito you mentioned, he is there to farm the super attack of all other vegitos... including the vegito you get from baba shop that will eventually dokkan to LR Vegito Blue

3 - it really depends on what you value... from a collection purpose, yes they are worth it as they are typically the rarest cards in the game (summonable ones like LR Gohan)... from a usability perspective, some are more worth it than others.... LR Hercule for example isnt the best of LR's from a damage perspective but someone like LR Gohan or LR Broly have their uses (Broly is awesome in WT due to attack all, and LR Gohan is a beast on any event due to his passive which gives him 3 ki per INT Orb or 2 ki for any other orb alongside his nuking ability)

let me know if you have more questions