When Obito became the Juubi's Jinchuurki he was stated to be stronger than Hashirama. Madara commented he could only have weaken him if he obtain Hashirama's Senjutsu.
Obito could apply Yin-yang to nullify Ninjutsu which was noted to stop Edo Tensei from regenerating and could kill them.
Orochimaru stands no chance against the Jinchuuriki. If he controlled Edo Tensei, he would seat back and enjoy the show. Of course he would be cautions of acting nonchalant as Obito still posses Sharingan which an illusion could be cast on him, releasing Edo Tensei.