Four of 10 scouts had him in the Top 10 that year according to Bob McKenzie. Some as high as 5th.. Further, he put him 12th. Taking him at 8 in a year where half the kids either didn't play at all, or had a shortened season is not some crazy leap. The reason he fell to where he did was because of the "don't draft a goalie in the 1st round". He's likely to be the starter next year in MIN and will probably be one of the top goalies in the league in a couple of years afterwards.
...and the Kings not taking him that high is a reflection on them, not Wallstedt. He's probably going to be a better goalie than Clarke will be a defenseman. That's coming from someone who was, and still is, thrilled the Kings got him.
You know who else had that kind of hype? Jack Campbell, the reason they say don't pick goaltenders that high, is because they are a crap shoot...
If you look the past 15 years for the draft, let's start in 2018 for development,
2018 top drafted G, 2nd round no games played in the NHL, 1st G drafted to play was drafted in the 3rd round by COL, 4 games played
2017 top drafted G, 26th OA Oettinger, helluva pick there,
2016 top drafted G, Carter Hart, 2nd round,, jury is out, but I would consider solid
2015 top drafted G, Samsonov, 22nd OA, jury is out
2014 top drafted G, 2nd round, no games played, 2 picks after, Demko and Nejedlovic
2013 top drafted G, 2nd round, 4 games played
2012 top drafted G, 24th OA, 84 games, Subban
2011 top drafted G, 2nd round, 23 games played
2010 top drafted G, 11th OA, the aforementioned Campbell
2009 top drafted G, 2nd round, Koskinen etc,
I can keep going, but there is a reason teams do not take goaltenders in the top half of the draft....