The main reason for that is due to cs go exponencial grow in every aspect (viewers, tournaments, number of teams, number of spots) until I'd say mid 2015, when it started to stagnate. Today every region has opportunities to play premier/major tournaments. Until 2014 it was very hard for non-EU and non-NA teams. Coldzera is playing at the big stage since exactly mid 2015, and he is performing almost every tournament.
It's subjetive to say which player is the best cs go player of all time. It's up to personal opinion about stats, impact, titles, eras, and how important it is to consider the growth of the scene. No right answer.