Hamilton and Trouba are top pair NHL D. Horvat is a stud 2-way center. Meier and Ehlers are already contributing top 6 forwards with potential to improve. Sergachev continues to improve, and is already on Tampa's PP. Granlund has had a solid career as a top 6 forward with a career points per game of 0.66. Kravtsov and Zegras are both top prospects with tons of potential.
If I give you a list of Crosby, McDavid, Kucherov, Patty Kane, Stamkos, Tavares, Seguin, Hall, Mackinnon and Anthony Mantha, and say that I don't think Mantha's career will be as impressive as the other 9, thus putting him at 10th on the list. Am I insinuating that Mantha is a bust and a terrible hockey player, or am I insinuating that he's not as good as the other 9?
The 9th overall pick in the last 10 drafts has been good. So saying he is the worst of the last 10 does not mean he is a failure. Surely you can comprehend that logic.