Meanwhile at Kansas, Embiid averaged roughly the same numbers as Drummond's one and only season, and he went from being a mid-first rounder to being the consensus #1 overall pick, while catapulting over sure-fire and highly touted NBA prospects like Wiggins and Parker. Just goes to show you what hype and general perception does for your program. Embiid will never reach the heights Drummond will reach in his time in the NBA.
So, I agree with your last point--Drummond will have a better NBA career.
But, there were narratives at play: Drummond came in as a potential #1 pick, and UConn came in as a potential National Champion, and both (relative to those expectations) disappointed. There were concerns about Drummond's motor, too. You can't draft a raw big man if he doesn't have desire or passion. I mean, there were all sorts of quotes about Drummond not really having his heart in basketball (especially in high school). He shouldn't have dropped to 8, but definitely shouldn't have been #1, and it was reasonable for him to tumble some.
Additionally, Embiid had the opposite narrative, and averaged 11.2 ppg (to AD's 10) on 62.6% shooting (to AD's 53.8%), 8.2 rpg (to AD's 7.6), and 2.6 blocks (to AD's 2.7). Those stats look similar, but Embiid did that in 5 fewer minutes per game. Putting it over 40 mpg each, Embiid stats clearly look better:
Embiid: 19.4 ppg, 14rpg, 4.5 bpg
AD: 14.1 ppg, 10.7 rpg, 3.8 bpg
If you just gave Embiid Drummond's minutes: 13.8ppg vs. 10, 10rpg vs. 7.6, 3.2bpg vs. 2.7.
In short: I think there were good reasons why Embiid jumped up to the top of draft board while Drummond slipped--and I don't think it had to do with some nefarious anti-UConn bias.