To be fair to Twomey, he hasn't done a phantom draft yet. He's provided top 30 lists based on the kids talent and performance to that point in the year. A phantom draft has to take into account where clubs have picks as they will have different ratings and preferences for types of players etc. Academy bids, father sons, picking locally, replacing needs and so many more factors come into things so it's far simpler for him to provide a top 30 list of the kids than a phantom draft.
Henry is a top 10 pick for mine both in terms of talent and where I think he'll be drafted. He's easily the best small forward available and there are a lot of teams who need that sort of player. personally, I'd have Robertson in the early/mid teens but as a WA kid, he probably rises in our estimations to be a solid pick at 10.