Actually, |GG|Crow_Nest, it is possible to have level 3 lightning by that time. You just have to level it up somewhere along the way before the vjun story missions. I have a couple friends who enjoyed lightning so much on the later missions that it was the first power that they leveled up.
"Size matters not."-Yoda
"There is no emotion; there is peace. There is no ignorance; there is knowledge. There is no passion; there is serenity. There is no death; there is the Force"-the Jedi Code