Ok this guy needs helps, it seems you do not understand this simple manga, and now you have turned it into recent feats.
4 hokages if we were to believe that orochimaru had perfected edo tensei at that time, isn't viable. Its only recently that he has managed such a feat, because hiruzen was a live prior to his latest feats.
Also im not sure why people are attacking Bogard. Its not only against the rules, you have to remember everybody has their own opinions. Whether he is a hater or not is irrelevant. Besides what he says about edo tensei can be used against him. If obito had unleashed izanagi or he fought minato side by side like what ems madara then, then minato's chances are slim to none, or perhaps if he had warped minato faster.
Similarly from Minato's rather poor arsenal thus far he cannot get past the orochimaru who fought 4 tailed naruto, nor the 3rd raikage without the shiki fujin.
Back to op ill make it clear again.
Oochimaru claimed itachi was stronger than him and that is why he left.
Whether orochimaru had perfected edo tensei or not is unknown.
If he had perfected it and he still claims that he left because he believed itachi is stronger than him, that you aren't doing yourself any favours