I'm not sure that's 100% accurate. Once you have transferred once, you can't transfer again w/o a redshirt year or a waiver. Hopefully, last off-season was an anomaly in regard to portal volume, because everyone suddenly had options they never had before.Much more difficult than NBA free agency. Basically everyone is on a one year contract.
I guess if you want continuity, you can recruit exclusively from the portal.... lol
At least the Illini are a Power 5. Imagine landing an under-rated Freshman at a mid-major and KNOWING there is no way you are keeping him around for a second year.