CREATE TABLE table_204_612 (id DECIMAL, "draft order\ round" DECIMAL, "draft order\ choice" DECIMAL, "player" TEXT, "position" TEXT, "height" TEXT, "weight" TEXT, "college" TEXT)

which player weighed the least ?
SELECT "player" FROM table_204_612 ORDER BY "weight" LIMIT 1
SELECT "player" FROM "table_204_612" ORDER BY "weight" NULLS FIRST LIMIT 1