Plenty of pros do though.
Ever thought that he's forgotten to suck the gut in when he poses. Silvio was one known for doing this.
Anyway, I think Kai has deserved his placings (awarded by professional judges) over recent years, but then again.. internet judges will debate that.
If he didn't have GH gut, he wouldn't have to suck in his gut at all; the ab muscles would hold it in automatically. There are plenty of pics of past pros, before GH, in relaxed poses (on stage and off) that never had stomachs like the pros of today.
Even if you argue that Kai is guest posing and wouldn't show that sort of gut on the contest stage, he needs to get that shit in check or not even waste the audience and promoter's time guest posing.