Again, no you don't. There are 4 teams that have won it all without consistent Top 5, vs 6 that have. that is hardly some wild crazy lottery type winning percentage.
expanding on this:
of the total 40 playoff teams:
Only 16 (3 unique teams) teams have had at least a Top 5 class in 3 of the 4 years before they were in the playoffs.
20 of the playoff teams have had 0 Top 5 classes and made the playoffs, 8 unique teams.
4 of the years that was only 1 consistent Top 5 in the playoffs. inversely only once has there only been 1 non-Top 5 in the playoffs.
Bama has been left out 2 twice despite ALWAYS having a Top 5 class.
Clemson is the second most frequent team in the playoffs, despite only having 1 Top 5 class in their 6 appearances.
Ohio State is the next most consistent in the Top recruiting classes, being in there 3 of 4 over any period, and they have been left out 5 times, that is half of the times. they have made the third most appearances.
Oklahoma has been 4 times, never had a Top 5 class when in the playoffs. third most trips.
Georgia has been in the Top 5 for 8 years, but only been to the playoffs twice during that run. three total trips.
Michigan is tied with Georgia for the number of appearances, and never had a Top 5 class when in the playoffs.
It is not at all a requirement to have consistent, if any, Top 5 classes.