Let's assume this random article I googled is more or less accurate as far as chances of succeeding in the majors.
https://sabr.org/research/chances-dr...titative-study
Let's put the guys who aren't quite worth a 3rd or 4th round pick down as 5th round talent (to be as charitable as possible) and make the assumption that players taken in the 5th round are more or less 5th round talents on average. You're looking at a 13-16% success rate of even making the majors.
Ok, that's not terrible. Certainly better than some categories of prospect.
But why aren't you drafting this guy in the fifth round at slot? Likely because he wants more than fifth round money. fifth round money slot averages around $350k and you start to see how it's not going to be very possible to sign a volume of these guys.
this doesn't make a whole lot of sense to me as a strategy, much as I might like to think the Braves are being smart.