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Oh man I have been plunging down this rabbit hole ever since team chemistry became a game feature. I've dumped team and player stats into excel, even replayed the same season with different milb coaches. So does chemistry matter? From the data I'd say definitely maybe. I can confirm players perform better when team chemistry is content or better. A little better statistically speaking.
Now as for coach ratings there is a definite trend in development when the coach has a high teaching rating in his primary skill. I replayed four seasons with the same milb team and made no roster changes with injuries off. Four different hitting coaches and the team BA with the Outstanding teaching skill was .277, with Poor it was .221. The other two were in the middle. Same team, same schedule.
This isn't proof by any means. All this s--t could still be random. But it is a data point.
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