A perspective on Rongmei Tribe Recognition

I wish to put my humble and simple questions for your kind clarification.

1. The 1313 Rongmeis in Nagaland is declared as Indigenous people by the Government in accordance with the recommendation of a Special Committee set up by the Government for the purpose. Here, my humble question is - under what condition this 1313 Rongmei will be treated? Are they to be treated as Tribeless people?

2. If I’m not mistaken, all Naga Tribes in Nagaland are not separately recognized as Scheduled Tribe except “Nagas” Scheduled Tribe. Under this nomenclature all Naga Tribes of Nagaland are treated as Scheduled Tribe. As such,  my humble  understanding of separate Rongmei Scheduled Tribe Recognition is also not necessary but the question is whether the 1313 Rongmei who fulfilled the criteria to be Indigenous people in the State of Nagaland will be treated as one of the Naga Tribes under the nomenclature of “Naga Scheduled Tribe”?

3. On the subject of recognition of Scheduled Tribe, is it to be done under the Act of Parliament by the recommendation of the Union Cabinet or under the Act of State Assembly by the Cabinet decision/recommendation?
4. Some writers frequently mention in their statement that recognition of Scheduled Tribe will be done only to ‘Aborigine Tribe’. Here, my humble question is - all the five Scheduled Tribes of Nagaland i.e. 1. Naga 2. Kuki 3. Kachari 4. Mikir and 5. Garo, are they the ‘Aborigine’ Tribes of Nagaland? And is the word ‘Aborigine’ one of the criteria for recognition of Scheduled Tribe under the Constitution of India/Nagaland?

My simple question given in the above is my individual not my community view and it is without any intention of blaming or defending any group.