The demographic composition of intra-EU migrants by nationality has remained broadly unchanged: Romanians make up the largest group, accounting for 27 per cent of intra-EU migrants, followed by Poles (12 per cent) and Italians (10 per cent). The main “contributors” to this exodus are the economic powerhouses – Germany and Luxembourg in the EU, but also Switzerland
I see plenty to disagree with here -- from conflating the 'richest' with the 'most talented' to odd use of parenthesis and quotation marks to conflating brain drain with the flight of capital. Brain drain refers to people with real accomplishments or potential in academia, science, entrepreneurship etc. who aren't necessarily rich.
Also: windows (in the case of Russia).
India and China, yes. Russia, South Africa and Malaysia, far from it. (Brazil is sort of a regional power, sort of not; it’s unique in being a soft power first type.)
BRICS was known for being strong economic growth candidates in the early 2000s. It was a package term for Goldman bankers to be able to sell their securities more effectively.
It might not be considered a power-house on its own yet but the potential is there. Obviously the current top dogs don't want one more big player at the table so the Brazil struggle is always to find a way to develop without getting into colission route with the West or the East.
Latin America is a whole "unexplored" world far away.