He's been shot to pieces for years. Beating a plodding Kowancki and getting sparked inside a round by Wilder doesn't exactly scream upset.
Joshua already marched through a legion of B-listers and fringe contenders like Martin, Breazeale, Franklin, and Old-Man versions of former contenders like Pulev and Povetkin (Alexander was still a decent win, having beaten Hughie Fury, Dillian Whyte, and controversially drawing with Micheal Hunter in his next three fights.) He was never in danger of losing to them, outside of a few scares. Washington, Helenius, Chisora. They are not beating AJ. No fringe or washed former top contender is. Joshua as become underrated and overcrticized. Historically, he is really nothing special, and the promotion is obviously overselling him (their job), but he is and always was clearly above the contenders of his era like Whyte or Parker, with only Fury and Wilder being the fights that would possibly break him. He is still a dangerous, big counter-puncher who is extremely well drilled (muscle memory and sequences) but is painfully average in the heart, ring IQ, and chin department. Yes, there is the avenged Ruiz loss, but in a ten out of ten fights, with full camps, Andy is not beating Joshua most of the time, even in shape. He is always getting run around on a bike. Joshua got carried away smelling blood, underselling Ruiz like everybody did. He was pretty much killing right hands with full weight behind them from round 1. Stupid, but somewhat admirable approach, and the knockdown he scored was actually picture perfect. Granted, many vulnerabilities were on display here.
@Rollin I agree about the Helenius fight but think there has been a decline in Joshua post-Ruiz 1. Most of the guys he marched through, as you noted, were prior to that bout. Since then he has been more risk-averse. I actually thought he fought very well against Usyk, but his style definitely has changed. At any rate, Helenius is upright and slow and can't counter -- made to order for AJ.
Helenius is dangerous early, saw that v Whyte when he shook Whyte a couple of times before going into sparring mode.
I'd love to see that happen. I love when guys who are deemed low risk step up and pull the upset. Of all the guys who supposedly wanted to fight Joshua, he picks this guy...what's wrong with Ruiz? Too afraid of him? He's already made more money than he'll ever spend, why not finish up fighting the best available instead of being a *****.