GTR is terrible right now, but he played on the highest level like 2008-2016
coldzera is terrible comparing with his peak, but he's still better than the average pro player. He started at the end of 2015, stayed absolutely god until end of 2017 (2 years better than anyone is very hard), and then even with MIBR trash he still played very well in 2018-2019. 2020 it's just a bad time, this online shit should not even be worth money.
device is very good, he was like current coldzera level from 2012 to 2018, and then absolutely god.
This ranking is like the title "all time"
But if device maintains this level he'll pass s1mple in a couple months, and coldzera - GTR in a year or two,