Napoleon once said he wanted generals/marshalls who were lucky more than he wanted them to be smart.
Managers are hired to be fired, and to me the only valid criteria for evaluating them are: 1) the team's won-lost record; 2) whether that won-lost record was above or below expectations. So far it is unarguable that Cora has done well on both counts. Of course, it's still early, and there is no way I or anyone can say the season will end as well as it has begun.
As for yesterday, here's how I think he contributed--
1. He kept his lineup of Mookie, Beni, HanRam, JD, Bogaerts, Devers, Nunez, JBJ, and Vazquez. After languishing for 8 innings, they came alive against the Ray bullpen.
2. He kept Price in for 7 innings, which to me was exactly right.
3. He plugged in Velazquez for 1 good inning (the 9th, the one in which we tied the game) and rookie Poyner for 2 (and the win). He also used his $13M closer, who for the 3d time in a row had 2 or 3 baserunners when he finally got his 3d out. Heck, I can't even fault him for using Smith because Carson is supposed to be able to pitch a good 8th: his career ERA is 2.29. Plus he left him in after the 2 run dinger, and he got 3 outs.
4. He plugged in Swihart to pinch run for JD after his single in the 11th. if Nunez singled, Swihart has a better chance to score than JD. Plus Swihart so far has the same OPS as JD in case he has to hit later.