Yeah I basically understand you. I think they are complete opposite midfielders and scorers, Dusty is damaging with the ball but isn't a massive accumulator and Crouch finds the ball at will but isn't damaging with the ball at all. If both fix the the other part of their game both would be elite scorers.
My issue with the Dusty pick is that he's had one spike year since he started playing in 2010 and that it might not come back, Crouch started in 2014 so I think that he can get better and I see vast potential for improvement if he can improve his kicking. Dusty has scored above 103.9 the past 3 seasons so he probably won't go too bad but Crouch actually averaged higher than him this year excluding the injury affected game. I feel like Crouch is a safe pick who has upside because he is Tom Mitchell like in his ability to find the ball, could get more time on ground and will rarely get tagged over Sloane. His 92 average in 2016 was also from 72% time on ground, and he's not going to regress in that sense.
There's a 2017 article from Fox Sports that says the following "In 2015, Crouch’s kicking was rated ‘poor’ by Champion Data. Last year, he improved that rating to ‘below average’ before lifting it again this year, to have his kick rated at the AFL average level."
https://www.foxsports.com.au/afl/ad...t/news-story/d5e8d0db88b97b8224f00d88b1d2e9d7
I get the sense that his kick rating this year was down, looking at AFL stats pro his high scoring in the 2nd half of last year coincided with improved kicking efficiency and his underwhelming scores this year were from a poor kicking efficiency. If he can kick a bit more and kick better with less clangers his scores could improve. I don't think that they will improve tremendously but they can get better.
However, I feel like he has less of a ceiling than Dusty and like you said Dusty has shown the propensity to go big, Crouch really has not. Dusty's disposals were down this year, if they get back up he's a great pick. Dusty played the exact same amount of time, 29% in the forward line, according to HS articles in the past two seasons. Both also played with injury problems this season.
In the end I'm probably picking Dusty even though I've stated Crouch's case in response to your reasoning but both are safe picks relative to their price.