So I would guess that is why you haven't heard that kind of talk. Last season passing game explosives were hard to come by vs this defense. This year, at least so far in scrimmages and camp, they've been beaten deep quite a bit.
If that extends into the season our defense will suffer a big fall in the rankings. Passing game leads to points surrendered.
As to why this defense is different, the loss of Johnson is one big piece. Cover 4 and 6 require great comms but also safeties who have a good feel for playing the middle. But another piece is the new DC. Morris keeps getting talked up about how much he knows irt our defense but I have not seen it in his previous stops so I remain skeptical.
The good thing here is that we have a lot of really good players. So it's not like the defense will crash and burn. They're just not gonna be a top unit IMO. Also I expect they'll start slow and get better as the season progresses, as can happen with a new DC as he figures @#$%& out and they figure him out.