The talent level is just too good to pass up from pick #1 to #6 IMO. You have a clear cut group of future studs, a couple of top line forwards, solid blueliners and top 6 talent.
1st group
Seth Jones
Jonathan Drouin
Nathan MacKinnon
2nd group
Alexander Barkov
Elias Lindholm
Sean Monahan
3rd group
Darnell Nurse
Rasmus Ristolainen
Hunter Shinkaruk
Nikita Zadorov
Max Domi
If I had to do a mock draft for the top #15, I'd look a little something like this...
Colorado: Jones (No reasons needed here)
Florida: MacKinnon (Can't pass up a shot of having MacKinnon center Huberdeau)
Tampa: Barkov (I can see Tampa going with a solid 2 way forward like Barkov)
Nashville: Lindholm (Landing 2 stud Swedes in the past month+ will help their offense big time)
Carolina: Drouin (BPA on the board and would look sick on the wing with one of the Staal bros)
Calgary: Monahan (They've been looking for a #1 center for god knows when, here he is)
Edmonton: Nurse (With all the firepower they have up front, Nurse is a solid pick for them)
Buffalo: Nichushkin (They aren't shy about drafting Russians and he's definitly a top #5 talent)
New Jersey: Shinkaruk (Can produce offense and lors knows we need it)
Dallas: Ristolainen (Dropped a bit but Dallas like's their Finns and he's BPA at this point)
Philly: Zadorov (Big, stong, physical d-men... that sounds exactly like their type of players)
Phoenix: Domi (Offensive dynamo, phoenix is loaded on D, so Domi was a logic choice)
Winnipeg: Wennberg (I don't know anything about him, so I just went according to other mocks

)
Columbus: Pulock (Having a future tandem of Murray and Pulock looks real promising)
NY Islanders: Lazar (He has the upside of a Mike Richards, really like this player, just not at #9)
Feel free to freak out and flame !!!