can someone explain how the minute something is tweeted from Brick’s it is retweeted on David’s

Not everything, though. Brick tweets basically every 5 minutes, David barely retweeted 2 tweets from him. I think Brick’s account is both handled by Brad and David’s usual twitter handler and himself. Brad is enjoying himself answering every tweet mentioning Brick and promoting David’s music. The rest of it and especially Gillian’s picture were tweeted by David or his usual handler.