The benefit to Jeremy is, he gets a better feel for which coaches really know their stuff,and have personalities, value systems, and coaching outlooks that might mesh with his. Never hurts to gain more intel on the field, refine your short list.
The benefit to every single one of the guys being interviewed is, it gets their name out there and increases their value in the market. Who knows, maybe being desired by Bama (last year) and Tennessee this year helped Freeze land the HC job at Liberty.
On top of that, some of the interviewees might indeed see the possibility of working for Pruitt in the future, even if it won't be this year. Getting known is just as valuable to up-and-comers as building a database of short list options is to the head coaches.