Top 10 picks aren't expected to be elite NHLers unless you have a fairly loose definition of what defines elite. In the 6-10 range you should be expecting a long-term top 6 forward or a top 4 defender. Only places to realistically consistently expect a top tier NHLer in probably in the 1/2 range on average. 3-5 should be top liner/top pair guy.
Sergachev could be elite, but being an elite #1 D would be above the average return for a 9th overall pick. Here is how I would breakdown the 6-10 range from 2005-2012 (past that is a bit early to judge).
Star (3)
Jakub Voracek
Oliver Ekman-Larsson
Mark Schiefele
Top Line/Top pairing/Starter (5)
Derrick Brassard
Kyle Okposo
Logan Couture
Jeff Skinner
Hampus Lindholm
Top 6/Top 4/fringe starter (8)
Nazem Kadri
Mikael Granlund
Mika Zibanejad
Sean Couturier
Dougie Hamilton
Jonas Brodin
Matthew Dumba
Jacob Trouba
Middle 6/5th defender/backup (6)
Devin Setoguichi
Sam Gagner
Colin Wilson
Josh Bailly
Mikkel Boedker
Michael Frolik
4th liner/6th defender/flameout (13)
Gilbert Brule
Jack Skille
Brian Lee
Peter Mueller
James Sheppard
Keaton Ellerby
Cody Hodgson
Jared Cowen
Magnus Paajarvi-Svensson
Brett Connolly
Alexander Burmistrov
Derrick Pouliot
Slater Koekkeok
Outright Bust (3)
Zach Hamil
Nikita Filatov
Scott Glennie
N/A: Luc Bourdan (unfair to include or rate him, we have no idea what he would have become).
While its a bit early to grade Koekkeok and Pouliot, I'd think its fair 5 years after there draft is that they currently look like 5/6 defenceman longterm. They could exceed it, but let's just leave them there for now. 16 of the 48 became clear top 6 or top 4 players. Only 3 of them became clear elite players by my standards. Maybe a guy like Trouba, Hamilton, Lindholm, and Granlund make that jump full-time as they all had flashes last year. But realistically, you should be happy if you pull in a long-term contributor in the form of a top 6/top 4 player.
I'd add, there has been a recent boom in this spot in the draft, with maybe guys like Monahan, Risto, Nylander, Ehlers, Werenski, Provorov, Tkachuk, and Horvat all looking like top-line players and potential stars. But, its too early to cement them there outside of possibly Monahan.