I think they're all decent picks but I tend to fade players coming off a premiership as starting picks. No evidence, just a thing I have. Oliver was one of my best trade ins last year after a hard tag. In terms of Miller, Gold Coast started last year with an even spread of CBA's between a number of players and by the end of the year it looked like Dew had given up trying to find midfielders and just told Touk to stay in the middle. I'd be surprised if he's allowed to attend as many this year. I don't have an opinion on how Sam Mitchell plays Titch though.
I am unsure of any of them. De Goey misses too many games and you cannot underestimate the d***head factor. He does have a very high ceiling but as far as I am aware he is not training with the mids in the Pies match sims. He is playing forward. But that could change.
We have been hearing Heeney will play midfield (or wing if you prefer) since Jesus did the loaves and fishes trick. Apart from sporadic bursts I am not sure he has had an extended shot at it. Happy to be corrected on that. Can go big but just as easily goes missing in action and produces sub 70 scores.
Butters you are buying on potential. No denying he has it.
So for mine two questionable picks and a speculative selection. I'm a speculator so Butters, De Goey (just) and Heeney.