I only know of 3 full-timers in the SI department. Trevor is in charge of the department, has 1/2 website duties and spends most of his time with FB. Jamie Does publishing (programs and paper), SB, MBB and Track/XC. John was part-time, now full. He is the other half of the web and used to focus more on women's sports. Now, the sports are divided more equally between them. I am not sure if that is overstaffed, but I would not think so.
When Greg started, we were just transitioning from DII to DI and he had people as well. later in his tenure a full staff. Remember that we did not even have a full time AD for quite some time (although Malmisar was full-time). coaches worked things out themselves. Tressel became AD with a small stipend being added to his salary. That was the only thing that got his income up over $100k. I do not have a list, but we have had 11 AD's (including Strollo).