Fr. Chazal was the first resistance movement priest to come to Australia around 2014. He originated the idea of attaching MC to SSPX to indicate that he and his fellow priests such as Frs. Ortiz, Pfeiffer etc. remained steadfast the the principles laid down by Archbishop Lefebvre after B. Fellay's sellout in 2012. He wanted it to be known that they were Mary's army. Corp - represented a small army. He tried very hard to get that idea over along with the italics themselves. I doubt anybody picked up on what he wanted to proclaim but the initials stuck.