Finally! Someone 'gets it.' A group (8+ bicyclists) IS actually safer in a clump despite all the 'those cyclists are assholes 'cause they're blocking traffic' types.
Today, we had a group of about 16 in a double paceline. 4 Lane highway with middle turn lane (either direction). Bunched up, we took up the space of two pickup trucks vs. being strung out for 4-6 pickup truck lengths.