The Two angels are witnesses to the most significant event that had happen to the Bride and the Whore. Who could be more credible than these two angels to show to John who the Bride and Whore were?

Rev 16:15 - Sixth Bowl Judgement -  Just about the time of  the gathering of the kings and the armies for the battle of Armageddon

 Behold (Look. here I am), I (Jesus) come as a thief (to snatch and steal away). Blessed is he (the Virgin) that watcheth (does not sleep), and keepeth his garments (extra oil), lest he walk naked (in darkness), and they see his shame (lost and stumbled).

The seventh angel showing the Whore is just a validation to the same logic that was established for the latter.

Be a Berean. The Holy Spirit is our Teacher.

YBIC,

eagle✞