and the sabe wisdom of the day is that they don't mean anything. That will change, subtly, over the next 5-10 years; they will find that to a small extent, breakout players can be detected from EXTREME springs.
As you are careful to say, Mojo, Michael Morse did in fact turn out to be a very rich MLB player ($35M career earnings)-- not a AAAA player -- who batted MOTO for a 2011 Nats team at a 147 clip. The year before he was 133. Then he broke down under the presumed 'roids. That's an example of a a cash-in success, and a clear one. He finished his career just shy of 3,000 PA at a 116 OPS+.
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I also read that 'Bach had the #3 spring of the last 15 years, or something, with the other two also coming in 2017 and 2016. Forget where.
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But this isn't about huge ST stats. This is about scouting the player. 100%. For me it is about the way Dan Vogelbach easily and casually passes on a left hand slider just off the plate, about the suddenness of his bat launch, about his new throughspeed, about the HIT tool he has always obviously had.
It was as easy to entice Frank Thomas into swinging at a ball, as it is to get 'Bach to do so.