I saw a shitty list and made mine.
1.) s1mple - s1mple may not have a major but he has won an ESL One Cologne and a IEM Katowice which are pretty much majors but ALL the top teams and one CIS or NA fluke team doesn't make it to playoffs because of a bunch of best of ones. 10 mvps 8 trophies
2.) device - could totally be #1 but he doesn't have the "godmode" that s1mple has but he has been top5 for 6 years now. Won 4 majors, 20 trophies and 15 MVps, most ever. 2 major mvps.
3.) get_right - top1 for 2 years straight, invented lurking in Global Offensive and set the bar for players like Happy and flusha. You never knew where he was going to come from and would destroy your rotates. 10 mvps and 22 medals
4.) coldzera - as much as I dislike him and his playstyle, he was extremely consistent on the best team of 2016-2017.. He has 2 major MVPs + wins, the highest rating at majors ever, 12 trophies, and 8 MVPs, and back to back top1's
5.) kennyS - greatest AWPer to ever play Global Offensive. He has had the second highest peak of all time only surpassed by s1mple. Kenny is the only AWPer to ever be the best player in the world. He set the bar for aggresive AWPers like Fallen and CeRq. Valve literally nerfed the AWP because kenny was so outrageously good with it. 1 major MVP and 10 MVPs. While he might have any top5 in HLTV's ranking he was clearly better then the three players placed above him in 2014. (the ppl that placed above him were JW, Snax, and pasha who were obviously worse players then kenny but just on better teams)
6.) olofmeister - This guy was absolutely insane. He would run out with a tec9 and kill your whole team while entrying. To this day, olofmeister is the only player who entry fragged and was the best player in the world by far. This guy was absolutely scary when him and krimz went onto a site together. While he is ranked higher in HLTV top20's, he has always had VERY good teammates that made him a little better then he actually was. (flusha JW and Krimz). He won 2 majors, 1 major MVP, 23 trophies, and 6 MVPS
7.) flusha - he was so good the whole entire cs community thought he was cheating. He is probably the smartest player to ever play counter strike and for my money a top3 clutcher in all of Global offensive. He ALWAYS steps up when you need him especially in majors and in big matches. His passive, lurk, and calculated style was the reason his teammates like JW and olofmeister could be so aggresive. He has 1 major MVP and 4 MVPs, 3 majors, and 20 trophies. #2 in 2014 (arguably #1), and #5 in 2015.
8.) GuardiaN - he has been on almost all of the top20 from hltv, he has been in competition for best awper in the world from 2013-2018. That's five straight years of being one of the best AWPers in the world. He pioneered the stable AWPing style (the opposite of kennyS) but I remember a GuardiaN flick. #2 in 2015, 8 MVPs, and 17 trophies.
9.) shox - kind of a controversial pick but he was been one of the most complete players in all of Global Offesnive. He could be the best AK player in the world, best pistol player, best clutcher, and could secondary AWP. Towards the latter part of 2013 after NiP were extremely dominant he was the best player in the world. In 2016 he got back to one of the best players in the world and blowing teams out of the water with ScreaM. He beat prime LG in a final with bodyy, RpK, and SmithZz on his team while IGLing. He has the most clutches in Global Offensive overall and could pull off unreal clutches. i.e 1v4's do or dies in overtime in the grand final crazy. He has won 1 major, won 14 trophies, and 4 MVPs.
10.) NiKo - NiKo has been a top3 player since 2016 on mousesports but he did have a rough 2019. He could pull of insane deagle plays consistently and has the best aim in Global Offensive history. He's been the best AK player for just as long and could one tap your whole team before you could even react. He has the highest rating at a tournament ever. He could be a lot higher but he lacks a major win and seems to always choke in big moments when it matters most. He's won 10 trophies, 6 MVPs and has gotten #2 and #3 in 2017 and 18.
honorable mentions (Not in order and im probably missing some): Snax, Fallen, Krimz, f0rest, and happy