I've already said it's small sample size. A season is small sample size.
But I can play my entire BL club, using SP1/2/3, against the two players in question. I can give them 50 AB each against those 3. Maybe it makes a difference, maybe it doesn't. But, under the current system, I don't care if one hit .109 and the other hits .437 because one may have gotten 50 AB against BL pitchers and the other got his against training camp pitchers.
The quality of the competition, as long as it's BL-level, doesn't matter. What matters is that they're facing identical competition.