Adding the two groups together you have 160 samples.
in this case 3 of 160 made it with top 5 paid QBs.
That is 1.9%
in the second group 17 make it without top 5 paid QBs
That is 10.6%
That is actually a huge difference.
Now those numbers are also skewed a bit since the first group makes up a smaller sampling of the whole. However, this is precisely why the first set of number is flawed being that 25 as a set is so small that even 3 over five years is a significant percentage.
So, if we take the total of playoff teams over five years at 20 and only 3 of those are from top 5 paid QBs you have 15% of playoff teams with a top5 QB, leaving 85% of the teams in the playoffs without.
I would argue that this last stat is the closest to being accurate for what we want to look at, but is also not complete.