Well Alys Wicksteed, the local apostle for Maori MP's Sharples and Tiria, have I got some bad news for you – Yes Maori were mostly not literate but Henry Williams was an expert in the Maori language certainly having the best interests of Maori at heart.
You seem to have conveniently overlooked the Littlewood draft treaty document that being Hobson's final draft of the Treaty when translated into Maori and then if you correctly translate it back to English, it equates almost word for word with the Littlewood draft. Viola! They are in fact the same.
There is only one legitimate Treaty, the Maori version. Not some fanciful, subsequently ‘created', after the event flowery Freeman interpretation that inexplicably found its way into the 1975 Waitangi Act and subsequent statutes
Perhaps you should ponder this – Governor Hobson read out his final draft in English (Littewood), to the assembled chiefs followed by Henry Williams who read out the Maori translation version to them.
After considerable debate in which Williams assisted Maori the chiefs accepted the treaty terms and, the Maori version was signed at Waitangi. The Maori chiefs knew exactly what they were signing. All the postulation since otherwise has no merit at all.

J Dyer, Tauranga.