in 80s, Aboorva Sagotharargal and Karakaattakkaaran released and both were Mega Blockbusters, both ran parallely without affecting other movies. Karakaattakkaaran was a Mega BB withn TN and AB was a Mega BB at TN, AP, KErala Karnataka North and Also Oveseas. In short, its a Global BB! Another actor's 3 movies released and departed theaters in btw the time span AB Ran!

Of course such a situation is surely not present now. Movie BO Dynamics hae heavily changed.