I think this is more than fair. Seager started slowly but he is a top tier 3B. Alonso is an outstanding LH hitter who people mistakenly think is a failed prospect. He is slugging .535 with a wOBA of .377 on a sustainable BABIP. He is not a flash in the pan. DeJong has 14 HR in 55 games. Maeda is a solid 3rd tier SP at $3. This seems more than reasonable for 2 months of Stanton and a mid-tier closer.