Board Thread:Questions and Answers/@comment-35546317-20180517165426/@comment-32271305-20180517172551

The biggest benefit comes from the bottom right path, and the top left one is also quite good, so you only need one or two duplicates to let the unit shine.

Getting four duplicates is very, very hard if you're not willing to spend money on the game. It took me almost a year to max out my SSJ4 Goku, and only because I got really lucky. Most of my units aren't even close to 100%, but a lot of them have one or two paths unlocked, so they're already great as they are.