Yeah, since you can read Hebrew I posted what is found in the Great Isaiah Scroll, (Qumran - 1QIsaa). It reads the same in all those references which were posted. However, one must be willing and able to see that הוא, (הואה in the Isaiah Scroll), does not always simply mean "He" but can also be read, (especially by the Prophets), as ה "The", ו "Ω/O/U/", (Omega), אה "A/AH", (Alpha). So then, for instance, one such as Yohanan the Immerser, being the greatest of the Prophets having been born of women, might have read this as also individual letters with individual meanings, instead of simply "He", as in "I am He", (אני הוא in the modern text, without the pointing, but אני הואה in the Great Isaiah Scroll). So instead of simply, "I am He", it may also be read to say, "I am the ΩΑ", (אני הואה). Now if you look at the context of each of those references in Yeshayahu, those which were posted previously above; it is clearly a distinct possibility that this is what the author intends, (though it cannot be said decisively because the phrase does indeed also mean, "I am He"). Shalom.