Even if you know a guy, you still need to know how he plans to fix the issues you have, what his vision is for the roster, and what his plan is for the QB position. Most of the good candidates show up with a full plan on how they are going to address all the issues and build the roster. You need to find out what plan all the options have first to see if you think it is a good plan and second because you are getting a fresh set of eyes looking at your organization and suggesting ways to fix it. That can be helpful and provide new ideas even if you don't hire them.