MINNEAPOLIS — Considering the number of close games these Twins have been playing all season, there are going to be swings of momentum all season like the sequence that played out in the sixth and seventh innings of Saturday’s game, when Willi Castro lined into a tough-luck double play with a pair in scoring position before Sonny Gray yielded his first homer of the year. That will happen — and it did, to sink the Twins in a 4-2, come-from-behind loss to the Guardians at Target Field, spurred by outfielder Will Brennan’s two-run blast off Gray in the seventh inning…