The data @HurrayTitans! posted doesn't bare that out.
But it does. The data suggests he himself posted shows that the likelihood of selecting a PB caliber player in picks 1-5 is 57%. That number drops to 41% in picks 6-10. Picks 11-20 has a slightly higher chance at 43%, but you can basically assume <2% is just statistical noise in this case.
A 15% difference is significant. That means in any given draft, if you draft in the top 5, you are more likely than not to draft a PB caliber player. The data on AP selections is murky, because there are so few AP selections in a given year. But it still suggests you are more likely to find one in the Top 5 than anywhere else in the draft.