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I would definitely agree that it's useful to compare current "lesser" leagues to MLB leagues from earlier eras and I have been arguing since about 2004 that the way to compare major leagues from across eras is to "curve fit" those leagues so that they have matching skewness and kurtosis (stats lingo for removing the changes in separation between star players and scrubs). I don't believe that Babe Ruth was much different in ability from Barry Bonds unroided, for example, but Billy Bergen would never have had a job in today's game (which is why the comparison to other earlier leagues works for me...because I think Cuba is much like an earlier MLB era in which the bad players were much worse, but the star players were the same).
I would guess, from looking over Castillo's profile, that he is more a star than a scrub...and that he will be paid as such. But the scouts would be able to tell me more here.