Vizard

While you got a point there I think that the SSJ we all know is the ones in Z. Because 1.The Broly movie is not canon
2.GT is not canon (Akira didn't produce it)

I think EVERY saiyan can become SSJ if he has enough anger. Look at it this way: Goku became SSJ because he was extremely angry at frieza. Vegeta became SSJ because of anger, jealousy and tough training. Trunks became SSJ by Gohan's death. Future Gohan became SSJ because of his fathers death. So to become a SSJ you just need much anger, so every saiyan can be a SSj

__________________