Well "easier" is a very individualized, subjective term. What is easy for person A may not be easy for person B, even if the standards for person B are comparatively much lower.
But regardless, the issue isn't about percentage of individuals getting acceptance via a specialized entry pathway. The issue is comparing the caliber of those students versus everyone else at the same institution who got in via the traditional, non-preferential pathway. Easy vs. not easy is a meaningless discussion and has nothing to do with my overall point - namely, that some M.D. students are actually lower-caliber (worse MCAT scores, worse GPA, worse overall application by objective standards) than some D.O. students at the "top" D.O. schools.