This is the most over hyped statement in Twins history. He made less than a dozen starts. Big whoop. Without looking, which was his Twins season and which was other random runs he's had with the Dodgers?
11 starts, 6-1, 66.2ip, 2.70 ERA, 3.00 fip, 80k, 10 walks
11 starts, 4-2, 60.3ip, 3.13 ERA, 3.58 fip, 63k, 17 walks
10 starts, 5-2, 57.66, 2.34 ERA, 2.76 fip, 69k, 19 walks
11 starts, 10-3, 65ip, 2.63 ERA, 3.40 fip, 65k, 12 walks
The trade made sense but it worked out a lot better for the Dodgers. Graterol has amassed more WAR in the same period than Maeta and that doesn't count his excellent post-season numbers.