CREATE TABLE table_204_783 (id DECIMAL, "position" TEXT, "player" TEXT, "free agency\ tag" TEXT, "date signed" TEXT, "2013 team" TEXT)

nick roach was signed the same day as what other player ?
SELECT "player" FROM table_204_783 WHERE "player" <> 'nick roach' AND "date signed" = (SELECT "date signed" FROM table_204_783 WHERE "player" = 'nick roach')
SELECT "player" FROM "table_204_783" WHERE "date signed" = (SELECT "date signed" FROM "table_204_783" WHERE "player" = 'nick roach') AND "player" <> 'nick roach'