Actually, in May is when all the movement happens inside FO's typically.
Immediately after the season is when Owners decide to fire GM's. New GM comes in and first thing he does is sort out his coaching staff.
Then the focus becomes the draft. Those scouts and FO workers have been scouting and preparing since September at that point for the draft, and are fully aware of the team's strategies and who they are looking at etc. Considering how secretive these draft boards are, it would be incredibly foolish to start "cleaning house" just a month or two before the draft for that reason alone.
I do get understand it would be hard, but at the end of the day if this years draft is great and next years sucks, does that say Idzik hired the wrong people or does it say Idzik was in control of the draft? I"m not a big fan of the entire process of knowing you are going to get rid of so and so and still let them do a job you think they suck at. In the business world, you'd be a manager who doesn't have a very long career. Or you'd be known as the idiot.
I mean if say they wanted Geno, convinced Idzik he was the guy, and Geno sucks, you can only blame fired guys for so long. And how secret are these draft boards really? Everybody knows the players. Some players wind up being surprises, others busts, but at the end of the day there are only so many good players and so many teams. And so many needs. Is it really about a scouts talent and skills to pick an Andrew Luck at #1 or a Geno Smith in the 2nd round? Hell picking Wilson in the 3rd round is about what?
When you have experts on tv, fans who think they are experts, and half the time they seem more right than the teams picking guys, what secrets are there really? Polian and the Colts FO were known to be great for years. Manning misses a season and they all get cut. How good were they really?
And considering the one guy jumped or is jumping to the Chargers just like that, who is to say you dont fire a person in Feb, and some other guy who knows a bunch of stuff gets hired.
If it only takes a few weeks to hire a GM who is supposed to turn the entire regime into a winner, why should it take that much longer for one or two scouts?