Pyu
Pyu appears to be an independent branch that shares some similarities with some neighboring Tibeto-Burman branches such as Meithei, Kuki-Chin, and Sal. Bradley (1997) also suggests that Pyu may be related to the Sal languages. Like Meithei, Pyu displays PTB *s- > h-. It looks like Luish languages were in contact with Pyu, but are not directed related to it. I have compiled <Pyu.xlsx>, which has Pyu data from Luce (1985) and comparisons from the STEDT database.
References
Luce, George. 1985. Phases of Pre-Pagan Burma: languages and history (volume 2). Oxford University Press.
Bradley, David. 1997. "Tibeto-Burman languages and classification". In Tibeto-Burman languages of the Himalayas, Papers in South East Asian linguistics. Canberra: Pacific Linguistics.
Selected lexical comparisons