I have posted like type of thing before, but I will try again.
In 2007, the Pittsburgh Steelers and Philadeplia Eagles tied with the Texans for last in the league in INTs. That's right, last. The next year, they finished sixth and 11th respectively. Was there a flaw in Jim Johnson or Dick LeBeau's scheme in 2007?
Just look at us: In 2007, we were sixth in the league in INTs with the same scheme and, I think everyone would agree, worse DBs than what we had this year. Why?
It just seems to be a highly variable and unpredictable stat. I would guess that it has as much to do with playing terrible offenses and/or mistake-prone young QBs or WRs as anything.
Even the great Charlie Waters said something to the effect that only one or two of 10 INTs are the result of a great play by the DB. Most of them come on flukey things like tipped passes or miscommunication between the WR and QB.
I just think way too much is made of wanting to replace a bunch of players because we haven't gotten a lot of INTs the last couple of years. People want the same points per game with huge INT totals, and it isn't going to happen. If it did, I would guess we'd be one of the best defenses of the last decade. Realistically speaking, that's pretty unlikely.