I would have believed ur theory if AKT was not such a dolt. We need to first wait to see why Aryan is asking her to marry him.
On the contrary, i feel they will show.. Imlie won't repeat AKT's mistakes n will trust ASR. The fallout of Adi lie was because of Adi believed what was showed to him..whereas Imlie's stand was whatever we see may not be the real truth.
So, when that revenge angle will come out in open... Imlie will dig deeper n find out the reason behind it instead of believing what is shown to her.