I do not think you'll see those 2.05 and .939 save numbers over the course of the season.
I think at stretches he'll have some good runs like that, and then s**t the bed for a few games and back and forth. Causing headaches and frustrations.
Team was 25th in the league last year at GA 2.99/ game
Getting him for " a song" is good, just ride with him for a while and if he comes out strong or gets on a good streak, package him and deal with him for an upgrade somewhere.