Vassily Ivanchuk was never able to become World Champion, the best he's been able to do is be the No. 2 in 2007 and 2011.
I don't think world ranking in terms of rating is comparable with being world champion. A player who is never rated #1 but maintains the world champion title for a couple of cycles is IMO clearly better than someone who is ranked #1 for quite some time but never becomes world champion, as the former has demonstrated the ability to play well when it matters the most.
That said, whether or not a player is a "genius" doesn't necessarily have to do with either world champion status or rating, so... I guess you can make your own call.
Vassily Ivanchuk was never able to become World Champion, the best he's been able to do is be the No. 2 in 2007 and 2011. Some people say that these results don't matter and that he can still be considered a genius. I read the article below and thought it be interesting to see what people on this site would say?
https://chess24.com/en/read/news/is-ivanchuk-a-genius
I like to think of Ivanchuk as being a genius.