There are more than three “serious” candidates but only 3 + 1 yet to be mentioned that I could imagine being hired. The yet to be mentioned isn’t earth shaking, but he (his people) initiated the interest and TCU is trying to assess if they want to throw his name into the hat at this point… It’s a combination of things, being so far along with other candidates they really like and this gent may or may not be seriously interested, plus a need to keep it highly secret if they did interview/etc… odd position to be in, which probably means he won’t ever go anywhere in this process.