Is he though? How can you really tell when there is nobody else who seems capable of properly challenging him and genuinely putting him under pressure? Nobody else has the consistency. World number 2 Robert Lambert, for example, ended up with 3 points last night.
If you look through history, the great champions always had someone pushing them. Funding, Briggs, Olsen and Mauger all had each other.
Nielsen and Gundersen had each other. Rickardsson had Pedersen, Crump, Hancock, Adams etc.
Since Zmarzlik started winning World Championships, the one rider to properly challenge him was Artem Laguta - and Laguta won and was promptly removed from the series.
Zmarzlik's most consistent challenger is probably Lindgren, who is not really a genuine rival.
Someone needs to step up to the plate to make this interesting. Can Kurtz do that? I'm not convinced. Holder maybe?
It's a shame Bartosz can't be transported into another era so we could really see how good he is.
To be honest, if you could do that and transport someone like Egon Muller into the modern series, my guess is you'd see Muller winning multiple World Championships and being hailed as a contender for the greatest of all time.