I'd wager Hicks bumped in peoples' minds due to the CF opening the Twins have now. It does seem like people had previously been fairly split between those two.
I think Arcia is going to be a better hitter. Both could be great. Hicks is not going to start in Minnesota this spring, but he should be an experienced player/valuable-trade-chip when Buxton is ready.
But I think that Rosario is going to break out this next season and leap-frog Sano, Arcia, and Hicks in prospect status. If Rosario had a full season last year, he may have hit 40 doubles and 20 homers. Not to take away from what Sano did last year, but I like Rosario's overall game better.
And then we got Meyer, who I think could leap over Sano and be a better prospect after he tears up AA next summer. Which would leave Buxton at 1, Meyer at 2, and Rosario at 3.