just try to put my opinion...
1.ExGon
2.Dusk
3.Ttobas
4.Abstract-
5.[224]Hyperw7
6.b-a-d-s123
7.mjj741
8.224dj
9.Spectator
10.Intensity
11.Deceitful
12.lineqtxz
13.zSkill
14.Motion
15.CheungB
16.Byeol
17.Rantanzyon
18.noraRcat
19.Habin
20.Pistoler
No Mod Specialist : mjj741
Hidden Specialist : b-a-d-s123
HardRock Specialist : ExGon
DoubleTime Specialist : Ttobas
Spinner Specialist : mjj741
Most Underrated :Habin
Easy DoubleTime Specialist:noraRcatsome extra notes:
Dusk:
https://osu.ppy.sh/b/325080&m=2 with 436 plays? i can't understand
lineqtxz:
https://osu.ppy.sh/b/737100&m=2 i'm not sure but i remember he got fc this with HD while it was in qualified
Rantanzyon:
https://osu.ppy.sh/b/240488?m=2 https://osu.ppy.sh/b/202756?m=2Pistoler:
https://osu.ppy.sh/b/86044?m=2 SS with EZFL is incredible
No Mod:
https://osu.ppy.sh/b/592113?m=2 so impressive for me
Hidden: hard to say which is better b-a-d-s123 or 224dj, but b-a-d-s123 is also good at HDDT and HDHR
HardRock: no need to say anything
DoubleTime: very hard to choose, but Ttobas is very well at AR8 CTB maps
Spinner:
https://osu.ppy.sh/b/741477?m=2Most Underrated: 1971 plays - LeaF - MEPHISTO [Spec's Overdose]