He went in to pitch a long relief outing, with the score like 8-1 in the 6th. When you end a game pitching three innings of relief with the lead and don't give it up, it is a save no matter what the score is. They are just gradually building up his strength to become a starter.
And, especially in 4x4 and 5x5 leagues, closers are not overrated. It is a terrible strategy to just forget about saves in a roto league, because that leaves you with alot of ground to make up in other categories and little room for error. An injury or two or bust will doom your season. Closers are less important in head to head leagues though, because you just have to win the majority of the categories each week.