I think the 2 are comparable and their stats show that they performed very similar over the course of the entire season. The difference is that Allen pitched much better in Akron than Curry did. Curry has more giddy-up on his FB buy Allen's slider is a plus offering and he's not exactly a soft tosser either. I would agree with you that Allen should be ahead of Curry, but it's close.
Williams is on a whole different level. He should instantly be in the top 100 prospects due to his immense upside. From there his performance should dictate if he moves up the rankings or off the list IMO.
I was giving Allen the benefit of doubt as Coveringtgecorner fans just ranked him 7th .... a little high for me. Curry on pipeline is #30 and #36 on FanGraph board, a bit low but showing how deep our system is. Key with Curry is he started at Lynchburg and Allen started at LC ... it kind of shows how FO thinks of them when Curry was drafted a year earlier. FO even had Gaddis in LC ahead of Curry but Curry jumped him even though Gaddis has a pretty good year too.
Shows big improvement w Curry but not top 100 worthy. One thing I worry about w Curry is jump in HR per 9. It was 1.3 in LC leading to 2.66 ERA. Allen HR also jumped in Akron but was .4 in LC for 1.58 ERA. As both were 2nd half stats it could be either a small sample size blip or hitting the proverbrial wall after taking 2020 off.
Yet, I have been looking at that stat as a drawback to pitchers trying to be too precise to stay wirhin with zone (to inflate k/w) rather than painting the corners even when behind in count. I look at Bieber and having both good command and being able to throw precisely enough to limit hr balls. I hate it when an announcer says a pitcher is accurate due to k/w ratio but you see catcher moving the glove to other side of plate or from top to bottom constantly.