Aish had a 144 and 120 that, from memory, was very harshly scored, he looked the goods that first year and hasn't ever got back there.
It's more just a buyer beware on him that those freakishly good games are the rare games at this point.
I do think there is reason to diminish how much credence last year gets, he was underdone and he was playing mostly defensive roles, outright tagging a couple of times, but you have to say he was at 70% to get to a 90 and a 90 would still be awfully no man's land of a range for him where you'd need a couple of very big scores, admittedly capable, to spike his price and then you'd have to have the cajones to dump him after those games.
He's a very tough pick, imo, if he doesn't blow the preseason to pieces. Let's say he's a season behind, which I think is fair, Walsh in his 2nd season got to 98, Oliver in his 2nd season, comfortably the best I can remember, was 111. I actually think you can definitely make a case for either of those, he was in their league as a prospect, but they also played 3x as many games in those first two seasons as Rowell has managed. That's basically asking he's somewhere in between the two best players of the past decade through their first two seasons for him to be a clear winning pick (Macrae was also in that class, fwiw so not impossible). More reasonably he's probably looking towards the 85-95 window, high end is acceptable, low end is very borderline, middle depends on if he can spike the price. All would put him in the range of lower tier rookies as a pick.
I feel like I'm against him when I do like him but I do want to be blown away, I remember Walsh didn't do enough for me to pick him his 2nd season (did last year), Oliver did, fwiw. I want to see similar to what I did from Oliver. His durability is very much a concern though and needs to be strongly factored in. He's in absolute no man's land price wise if he gets hurt in the first 6 weeks basically, that range that ends up spiraling into multiple trades if it happens and he's had a terrible run with injuries so far.
Ultimately I do find it hard to say he presents better value than the Coniglio, Gresham, Rioli, Anderson, Coleman, Jackson, et al types in the forwards or backs who are similarly cheap, have similar or better durability and considerably lower requirements to be big wins.
Definitely not ruled out but I need to see a lot personally. Midfield midprice picks just have such a high requirement on them to be big wins and he's got a lot of pathways to failure popping up.