It's not a 3 way tie... the Saints lost the head to head against the Bucs and the Clowns. So the Saints are 3rd. Just about every game of the last 4 could determine who wins the worst division in the NFL.
Actually, it's a three-way tie. That's why the whole head-to-head thing comes into consideration. Because it's what's referred to colloquially as a "tie breaker". 😉