It's spin, not because 0f the stats, but because most of your other points apply to every position.
Seattle D (I don't mean to belabor Sea. Just the name that stands out as one of the best) Has been solid 2 years. Ravens and Bears had nice runs, though both struggled this year. SF and Car. will both be good next year. I would take any of those 3 (not Bears or Ravens) to plug in and forget next season....AT a 10-12 round pick.
Citing inconsistencies in fantasy is silly. Which position doesn't have them? (ok...maybe that kicker you are keeping). I can show you just as many 1-3 round RBs that got out performed by ww RBs this season. That's every year and every position.
As far as point difference between 1-10? Not sure. I don't have the "all fantasy stats all the time" website you're referencing so you tell me, but be fair and also list 1-10 RB, QB, TE, & WR. I'd bet it's pretty close to DSTs, though with your DSTs averaging 7 pts a game I'm not sure.
In fact, this whole discussion could be a result of different scoring. I remember the SOFFLII scoring system (start @ 5 and go up or down) and I can see your point a little more clearly. In PFL we start @ 24 and it goes down quickly, barring TDs so a system that favors DSTs would obviously make more sense to invest earlier in a DST.