Of the names you me
Of the names you mentioned, Rupert Spira is very helpful as a teacher for new people to learn meditation. From that starting point they can move into many different directions. It's a place to begin from, not to finish at.
Personally I find much lacking in the larger geopolitical schema that internet nonduality personalities lend themselves to and for that reason regard nondual spirituality teachings as unfinished. The application of metaphysics to social concerns is a major blind spot in all online spiritual communities. It is only remedied by concurrent study of political philosophy, economics and so forth, as well as with international travel, networking and active engagement on the ground to get direct insight of things.