I just don't see an overlap. The BLM throw bricks throuh Footlocker because they want free Nikes. The antifa just want to throw bricks through the windows of Starbucks, 'cause they hate their boss. Can't we all just get along?
BLM are realizing they are serving as the useful idiots of “antifa” by making the anarchist agenda appear more widespread/popular than it really is.
If a dozen pampered white radicals join a hundred blacks protesting a shooting, they can ratchet up the pressure and present the appearance of 112 people ranting against the capitalist system. From this article, it is clear the blacks finally understood the game (though plenty were already complaining on the internet about it).