I don't exactly know on what part of the above conversation you're referring to, but those three being in their Org robes is because they were like this the last time they were seen independent.
One sentence before those scenes was "All pieces lay were they fell", which means these symbolic scenes show current status, not past nor future. Everyone of those characters is "sleeping" at the moment and not present in the Realm of Light, but connected to Sora and calling out to him to rescue them (except Axel who is not calling out, but that has already been hinted to be a special meaning).
Oh, and you do realize the bold part is absolute nonsense, don't you? Roxas can't be Ven because Roxas is Roxas and Ven is Ven.
There is a reason they were shown both separately in Blank Points as well as in Coded!
Not to mention it was already told several times that despite looking the same they are completely different characters.
I dont disagree with you here, but then that raises an interesting point. What will happen to Roxas when Ven is saved?