Your defence is mid at best, if not in the lower half of the league. Ekholm is a solid top 2 D-man, but I think he will decline after this season. Bouchard is getting carried by Ekholm and is great on the PP, but if this guy is your #1 you won't be winning the cup, as his defensive game still needs a lot of work. Nurse is overpaid as we all know, and is more of a #4 at this stage. Kulak is an ok #5 and a solid #6 D-man. Emberson is still a big question mark and Idk if he is a legitimate top 4 D-man.
Stecher / Brown weren't good on a lowly Yotes team, idk how this is going to change on the Oilers...These guys are what they are. Depth D who can fill in.
Ekholm and Bouchard are a very good top pair. The results speak for themselves. There's nothing mid about how they played last year, and no reason to expect that they won't play well again this year. We're talking about this year, not 2 or 3 years down the road. We will need an Ekholm replacement eventually as he ages, but let's not get too far ahead of ourselves, we're talking about this year.
Nurse is overpaid, yes, but his play will dictate by just how much moving forward. He's had some years where he is only slightly overpaid, and some where he was pretty bad and was worth half his contract. His partner, whoever that ends up being, is our biggest hole, and the area of biggest concern on our roster.
Kulak is among the best bottom pair defensemen in the league. Again, the results speak for themselves with that. Suggesting he is an "ok" #5 is selling him short.
Emberson is a question mark, you are correct about that. There are reasons to feel optimistic though, he had injuries, but his advanced stats with the Sharks are very good compared to his teammates, so there might be a player there. He would slide on to our 3rd pair in an ideal world, but he may get a look beside Nurse to start the year to see if he can fix that hole for cheap.
Stecher is a good #7, who can fill in as a #6. He's been around long enough that everyone knows what he is - depth that can play every day, but probably shouldn't. He'll start the year as our #6, but I don't expect he will be in that spot come playoff time. And he's a fine #7 for a playoff team.
Brown isn't good. I didn't like that signing, and I hope that sooner than later, he ends up on his way to the AHL. I suspect he was signed for that role - that's the only explanation for his cap hit and term - that they signed him for a bit longer and bit higher than he should have earned, in hopes that it deters teams from picking him off of waivers.
So it comes down to what I said in the post you quoted - we have one hole, and are filling that one spot away from having a very good defense core. The results of the blueline that we had last year after the Oilers horrendous start were pretty impressive, and the only key piece to that group that we lost, we had to improve upon anyway in Ceci. We also don't need that hole filled on day one, as long as we fill it before the playoffs, I am happy. If Emberson doesn't work, we need another bottom pair guy, but I'm not worried about finding one of those, there will be a bunch of #6 defensemen available at the deadline, just like every other year. It's that 2nd pair RD that is the issue right now.