Morton was pitching well (Go look at his pitching line from that game). And the said inning question went like this: K, BB, Fielder's Choice, Infield hit. Not like he was struggling. As for Anderson coming in and getting the out, yes he did. And what happened the next inning he pitched? Line out to Center, Single to Deep Right, Single to Right Center. He did get the DP after that but was lucky not to give up any runs. So what if this had happened 1 batter earlier (remember there was already 2 runners on when they lifted Morton)? At least 2 runs would have scored and then it's 3-2.
I'm not saying it's farfetched to argue that putting Anderson in was a defensible move. But you have to remember he wasn't in mid season form (he had give up a run in 3 straight appearances, his WHIP was increasing, and his K levels were dropping). He was fortunate things worked out.
And now to on to this game. Blake Snell 5.2 IP 2 H 0 BB's and 9K's on and you take him out after a lousy single (which was the 2nd hit of the night)? I'm sorry, I'm not pulling him there. And if you were to pull him, why would you put in Anderson who has (God I'm tired of repeating this) allowed a run in 6 straight appearances (9.2 IP) and has a 6.52 ERA during that span? It doesn't make sense.