There are not 2 "I"-s. But there are "I Am" and "I am this". The first is the higher truth that is not separate from the Absolute. The latter is a false notion.
However, as long as this knowledge is theoretical, a Seeker must submit to Lord "Om" or "I Am" and/or to Guru, instead of teaching the notion "I Am God" or "I Am Brahman".
That is what Shri Ramana Maharshi and most Hindu teachers teach. This is also taught in Veda, which says that the Atman in non-dual and that the first born Person (God/Word/Purusha) is not separate from that. All souls are of the Purusha. The truth is non-dual. Yet, it also teaches of two birds perched on the same tree: one non-Lord restless bird hankering for fruits and another Lord bird merely looks on. The restless bird obtains peace when it sees the Lord.
I am yet to see the Lord.
In summary: I believe that the truth is non-dual. But I do not think that it is practically true if the knowledge is merely theoretical. But it is me.
Your mileage may certainly vary. Each one should know for oneself.