can the OP give us a link to Sakuraʻs DB4 profile?
Anyways, I donʻt see whatʻs wrong with her being on their level, as she doesnʻt need to be able to stand a chance against them in an actual fight to still be on their level. Both naruto and sasuke are bad matchups against her since both have attacks that make byakugou meaningless, and both have very easy ways to land hits on her. The biggest reason that she can be on their level, yet not stand a chance in a fight is because ninja abilities are not only ones that involve direct combat. Sakura is mainly a support ninja, once she got byakugou, what did she do? Did she join the fight like naruto and sasuke, or did she step on the sidelines in order to heal the entire alliance? Itʻs her support abilities that allow her to be on their level as an overall ninja once naruto and sasuke start stepping things up with chou oodama rasenshuriken and susanoo.
Tsunade would get curb stomped by someone like oonoki in a 1 v 1 fight, yet sheʻs arguably even more useful than he was against madara, and definitely more useful than he was against the shinjuu due to her support abilities.