Ericsson is a legit #1. Kronwall makes too many mistakes and takes enough bad penalties to knock him off that top tier.
Not to be an ass, but...are you high?
Re: Orpik - I have a very, very hard time seeing Orpik coming to the Wings. And I don't think he's quite what we need on the back end anyway. I think we need a solid puck-mover, a guy with Real Good offensive instincts. Smith and Kindl have been disappointments, and Quincey has been a train wreck. We're not getting nearly as much offense from the defense as we thought we would. To which someone will probably say, "Yeah, but you like Girardi. He's not an offensive defenseman by any stretch." True enough, but he moves the puck very well, among other things.
As for the nuts and bolts of these hypothetical trades, e.g. Edler and Visnovsky - tbh, any solid top-four defenseman is probably going to cost more than we'd ideally like to give up. Edler almost certainly would make us wince, in terms of the return. And Snow could very well say, "Screw off. Visnovsky is essential to our blue line and I had to put my natural charm into overdrive to convince him to play for us. And now this whole Vanek thing is threatening to taint my otherwise perfect legacy. So I'm not giving Lubo up for anything less than a top-six forward, a good defenseman, and a first-round pick." Which wouldn't be worth it.
Solid top-four defensemen are so highly coveted these days. Hats off to Gillis for getting Diaz for, basically, a nobody.
"If I were to wish for anything, I should not wish for wealth and power, but for the passionate sense of the potential, for the eye which, ever young and ardent, sees the possible. Pleasure disappoints, possibility never. And what wine is so sparkling, what so fragrant, what so intoxicating, as possibility!" - Kierkegaard