Define pure upside?
Bjugstad certainly has an array of impressive tools, and is certaimly underepped as a prospect on here. Re-rankings of the 2010 draft is a redundant process anyway, but Bjugstad seems not to feature on too many. Which seems odd. He's statistically on a highly encouraging trajectory and when you add this with the skill-set ; frame, physical play, ability in the Offensive zone and his two way play and you do have a serious NHL prospect.
However, i think it's a little dramatic to suggest offensively he has quite the ability of the elite of the elite prospects outside the NHL. Players like Huberdeau, Kuznetsov, Granlund and Tarasenko are all IMO dynamic offensive players. Bjugstad is a little different. No doubt he has the tools to be a dominant force in the NHL, but it will be through a cominbation of high class skills, rather than the gamebreaking offensive talent that i see in Huberdeau or Kuznetsov for example. Their more dynamic Offensively ; more flash.
Granlund will produce at an elite rate at any level. His skating and frame aren't high end, but the skills with the puck and more importantly his understand of the game is so exceptional that i can't see how he doesn't translate to the NHL in an eventual dominant fashion.
Either way, Bjugstad is the clear 2nd best Forward prospect in the Florida system and along with Huberdeau, will have the most long-term responsibility in how Florida develops as a team.