To have Kessel on this team, they'd either have to not re-sign Krejci to the contract he got, or get rid of some other guys. I'd rather have Krejci than Kessel, and obviously that's how the Bruins felt as well. Krejci is a 2-way forward, Kessel is not. Kessel scores a lot of goals, but check who he scores them against - the teams like Edmonton, the Islanders, Florida...the bottom of the barrel.
For those #2 picks, Kessel is not in the same class as Malkin, Eric Staal, Heatley, and probably Spezza. It's too early to make a comparison to JVR or Doughty. He's probably on equal footing with Jordan Staal, and better than Lehtonen.