That Defense wins championships does NOT mean that the O doesn't matter much.
Rather it means that all things being equal, the better D gives a team a better shot at winning, especially in the playoffs.
There was one anomaly that I can think of, when the Trent Dilfer led Ravens had almost no O at all, but played turnover free ball and then left it to the D to stuff everything the opponent's O tried. But it is indeed an anomaly. In today's NFL you need a high powered O as well. The Pats keep winning because they always have a good O to go with their good D.
I'm kind of thinking that what we need to do is keep our O intact and let it grow and develop. It's already really good (you don't lead the league in scoring, even not playing your starters in one game, as an accident). So what we need most is to bolster some areas of need on D; areas (like the run D) that were exposed during the year and in the WC round.
Let's face it: anyone see a 3-4 D out there with a 280 lb. NT......other than the Rams? It's that way because Wade just didn't have all the pieces he needed to get the most out of his 3-4 scheme. So I expect Snead to get those missing pieces, even if it might involve some vets past their primes, but they are built for the positions in Wades 3-4.