Devah Thomas, left, and Anthony Atkins were assistant coaches together and became friends at Salesian and St. Pius X-St. Matthias. It’s quite a weekend for Salesian coach Anthony Atkins and St. Pius X-St. Matthias coach Devah Thomas. And there’s this: Former Salesian players Deommodore Lenoir and Keisean Nixon are facing off on Sunday when the San Francisco 49ers play the …