BRICS can NEVER be equal share as long as China is part of the major party. Ask China whether they will bend down their Financial Policy to the like of Russia or South Africa and you will know. The same thing happening to EU will definitely happened to BRICS where Germany and France dislike being on equal term with country like Hungary or Latvia. And you are talking about Germany or France being 3 to 5 times the size in term of economy vis-a-vis Hungary/Latvia. And China is 3 to 4 times the size of the entire BRICS combine.
BRICS are a Chinese enrichment club, there are no absolute advantage for anyone in BRICS other than China, that's pretty clear from the get go, yes, the other country might have a taste of glory from partnering with China, and they should, but it would be kidding yourselves if any country will think either they can be the same seat at China in BRICS or it will benefit them more than the other.