True, but if Oro were still active all kabuto's EDO's would belong to orochimaru
Not entirely true....Kabuto made these preparations with the intent of having to deal with war as a means to work with Obito to aquire Sasuke's eyes in order to get the Rinnegan.
Now it would make sense if Orochimaru had gone through the exact same planning process, but why then have the need if he was still active?! If he was, it would be because he had taken Sasuke's eyes instead of dying...he would have no need for it.
Orochimaru also mentioned how he had no interest in the war so he might have shared the same thoughts had he been alive.
Kabuto made a point that he did in fact go through the process of collecting these bodies on his own so he didn't just take Orochimaru's contracts.
But in theory yes, Orochimaru could have easily gone and done the exact same thing as Kabuto....it was merely mass grave robbing.