I have my idea of the reason why we are where we are. Mario, IMHO, has two BIG faults:
A) Even if everybody knew Gattis was toasted since November, he started to consider candidates seriously only way after ESD and probably not even before NSD.
B) He is stuck with his first option and unless he receives a firm "NO" he won't back down (we all know who he is at this point).
The explanation? Mario is obsessed with recruiting players and coaches, he probably uses the same pitbull-ish approach. Points A) and B) can be explained with this facet of his character: he delayed the hiring process because of the recruiting calendar and he's willing to recruit his first option since the end of times (Do you remember that Mario has to be convinced by his staff to let go the Cormani situation even after all that circus?).
This leads me to the "strange" interview calendar that came out late last week and this weekend: nothing transpired for weeks (months) and all of the sudden we know who's interviewing and when. Why? Maybe because the REAL interview process started late last week and stretched out during the weekend.
Two weeks ago many respected insiders thought that we were close to a done deal with the first option, then nothing happened and the week after that we started to hear about the interviews. Why? Two options and both could be true at the same time: Mario is covering his bases waiting for the first option's decision and he's interviewing for potential assistant/analyst jobs.
If I'm right, which I don't know and probably not, this won't be over quickly and I believe another round of interviews will take place this week unless the above-mentioned first option says "I'm in".