Well, really they need a legit #1 defenseman.
Rutta is so inept offensively, and so many plays die on his stick that I don't think he's NHL-caliber any longer.
Obviously. But that's not realistically happening in the near future.
IMO there are four ways to get a #1 defenseman historically: a) draft one in the top-10 and get lucky with their development, b) draft later than the top-5/acquire via a trade a promising young defenseman and get lucky with their development, c) acquire a mid-20's middle pairing defenseman and get lucky that he develops into a true #1D, and d) acquire an older kinda-sorta-#1D with extenuating circumstances and/or considerable future risk and get lucky that they maintain #1D level play into their late thirties. Think a) Heiskanen/Makar/Doughty/Sanderson, b) Vlasic/Karlsson/Carlson/Slavin, c) Burns/Forsling, and d) Boyle.
You can't just go out and "get" a #1D. I am of the (potentially unpopular) opinion that while there is such a thing as a "gimme" #1C that you can draft and be absolutely certain they will be a #1C (like Macklin Celebrini), there is no defensive prospect that is ever good enough at age 18 to be absolutely sure that they are going to be a #1D. Rasmus Dahlin was the most hyped defensive prospect in a decade and he took forever to get to #1D status (and personally I don't love him). Owen Power seems like he's likely to top out at good #3. Artyeom Levshunov could end up just a good middle-pairing guy.
For now, you build the best defense you can by committee and hope that someone like Dickinson (or potentially Schaefer) becomes the guy you need him to be. Part of developing a great defenseman is setting him up to succeed. Part of that is making sure that when our prospects break into the league they have a partner who can complement their skills and be a functional unit.
Back to Rutta--I agree he isn't an every-day caliber defenseman. I think he's a fine #7 and an okay #6 if you have five defensemen who are clearly better. We don't, ergo Rutta is a problem. But he looked pretty decent with Mukhamadullin in his short action last year, maybe some chemistry will carry over...