Be careful when comparing the average GPA and MCAT scores for M.D. and D.O. schools. The M.D. average comes from over 120 schools, including the big guns like Harvard and Johns Hopkins. There are only about 20 D.O. schools. And really there is no Harvard of the D.O. world.
If you really want to compare the numbers you need to do a one-on-one comparison of specific D.O. and M.D. schools. You might be surprised that many D.O. schools have higher GPA and MCAT numbers than many M.D. schools. And, conversely, many are lower.
Easier to get into? Just different. Like comparing apples and pears. Similar. Both great. But each unique.