All that is only true if you only brought in the 20 portal guys for one year and then no more for the next 3-4years. If you're doing that every year, it's a much higher percentage, even if you have 150 guys on the roster. 15 guys every year would be 60-ish on the roster, which is 40% of a 150-man roster.
We have brought in about 30 portal guys over the past two years (though some are already gone). Even just that is twice the percentage that Rhule mentioned on a 150-man roster, let alone a 105-man roster. Let alone doing it for four consecutive years.
Again, I don't have an issue with it. We should probably be among the highest percentages among the Power 4. I just think it's interesting.