Its look like u don't no the meaning of hold back, because no body ever hold sasuke back it was only his jealous of Naruto, the hatred and resentment he habor toward his helder brother. Orochimaru only bite him, and Obito was only doin everything he could to low sasuke to his on course and sasuke only gain any real power from his brother Itachi d only true strong Uchiha after learning from shisuhi.