Board Thread:Questions and Answers/@comment-35007600-20180315194108/@comment-34447131-20180321123532

I wouldn't... I assume your Goku ssj1 angel has SA10 if he is almost rainbowed. So if you dokkan him and feed him to your power brawl SSJ3 the SA would only be raised by 1. You would lose a unit with SA10 and many orbs that have been spent.

So it would be better to farm 9 other "heading for a showdown" SSJ3's to raise the SA of your power brawl Goku, but that's a hard grind.