yakupov is better offensively than nugent hopkins (scout consensus), grigorenko trumps couturier in terms of offensive potential but also gets a slight edge over huberdeau's offense. Galchenyuk trumps couturier in terms of offense and is about as even with huberdeau. forsberg is also a lot more talented offensively than landeskog is.
Look at these people overrating landeskog. He is a great player and one of my favorites. I have his rangers jersey and I already ordered an Avs one but holy ****. Landeskog isn't an offensive powerhouse. He will be a great 30 goal power forward probably but in terms of offensive talent Forsberg has more potential.
I actually think that one of Galchenyuk or Grigorenko could have higher offensive upside than Yakupov. I won't say it's for certain obviously due to a number of factors including Galchenyuk's missed season, Grigorenko's work ethic, the teams that draft each, etc.
However, I wouldn't say it's unlikely given their natural positions at center and size. It's like comparing Toews to Kane.