Something important there,maybe there is a lake named moriri or so on.
Save your words and energy,Indian know well Han and Tibetan are the same people far differ from them.
So I get it,it's about evidances.But issues easy or difficult to solve is another matter because sovereignty is core interest proved by nation's power.
As I know Chinese are used to deal with something easy to handle instead of the ones more difficult ,that in Chinese避重就轻.
I can not understand why you say land border problems are much easier to solve comparing to sea/iland disputes while I think the contrary.What's your logic?
Indian want Chinese to notice the small area Chuma as thorough point of the border issue between two nations instead of noticing treasured Arunachal in where the PLA has no chance to take such action.