I think the reason you draft a polished player if you are Minnesota isn't to rush the time table, it's more that they already have their franchise players. They need to find skilled players to fit with them rather than swings for the fences. If they blow top 10 picks on busts they are going to retard their progression. I think the worse you are, the more you should care about a players ceiling. The better you are the more you should care about their floor.
That's understandable, but I'm not sure I agree with Minnesota already being set with franchise players. I'm all-in KAT; I have no doubt that he's going to have a HOF career.
It's probably fair to pencil Wiggins as a future franchise player as well. I'm not convinced that anyone else on the roster will get there...and you could argue that they don't need anyone else to get there. KAT is so special that I wouldn't argue against that. My point is that I think they only have two set pieces, and both of them are so versatile--KAT has the length, athleticism, and shooting ability to excel at either the 4 or the 5, regardless of whether opponents go big or small; Wiggins will capably defend the 1-4 spots in his prime, and his outside shooting will come around--that you can fit pretty much any type of skilled players around them.
On the other hand, Rubio, for all of that he does well, still has such glaring weaknesses that he's the type of guy that you have to surround him with players with very specific skills (namely, plus outside shooting). He's only 25, and he's talented, but I'm not convinced that he's set in stone as a long-term piece. The fact that KAT and Wiggins are so young means that Rubio will be exiting his prime just as KAT and Wiggins enter theirs.
LaVine has a ton of potential, and he fits the same timetable as KAT and Wiggins, but is he going to be a top three guy on a contender, or is he going to be a bench scorer who isn't well-rounded enough to play an even bigger role? Seven years ago, Jeff Green was part of OKC's Big 3. A year later, he was still part of their Big 3 when they made the playoffs for the first time, but he was eventually surpassed by Harden and Ibaka.
Outside of KAT and Wiggins, I don't think there's enough certainty about the rest of Minnesota's roster not to swing for the fences if they see a gamble worth taking. If you draft Buddy, do it because of his ceiling, not so much because of his floor.
