Easy, CB and RB are the two positions where rookies come in a make immediate impact the easiest. I never said he'd be as good, and I recognize there will be a little give there. I also think the take of an improvement at ILB in Mayo, and the improved health of Seymour will outweigh the give. Stop putting the +/- into a positional vaccum. Look at it as a team, because, according to what I watch on TV, that is how they take the field.
Why do I care about preseason power rankings, and more importantly, the cholesterol clogged musings of Jason Whitlock? They've all changed their tune already after one week. It's all about the Lions, Rams, and Raiders now. Two of whom, not coincidentally, are upcoming games for the Patriots, which brings this full circle back to the ease of their schedule, something you continue to ignore while you try and parse minor quibbles about the general statements people are making.