Which is precisely my point.
You said he let them free because he needed them to talk.
I proved you wrong since they can talk while controlled.
Still doesn't show he can control them.
Why would he waste his chakra on restraining them if they decided to stay calm and talk with Sasuke?
And about controling. Orochimaru DECIDED that couldn't move even though he wanted to. If it's not control, then what is?
Orochimaru has already shown his talismans that supress personalities and let him control his EDO. Moreover, he managed to fight himsel and use both Hashirama and Tobirama in P1 at the same time (well, P1 or P2 doesn't really matter, since when for example Tobirama has his personality erased, it doesn't matter if he's on 30, 50 or 100% of his power - he isn't breaking out).