From my experience
1. Plabax / Freydey / AngryJay93
2. Carse / Uncle Seth / TomKabs / Swos
3. IceStorm / FPB / Zalex / KGMan
4. There a ton here, too many to name
You have a lot of Classic, but here's GDL list ...see some familiar names in the finals?
GDL 01 - TakeYourPill (def. angryjay93 in 6) - Feb'07GDL 02 - EricAnthony (def. kgman in 5) - Oct'07GDL 03 - kgman (def. angryjay93 in 7) - Mar'08GDL 04 - angryjay93 (def. IceStorm in ?) - Sep'08GDL 05 - swos (def.IceStorm in 5) - Jan'09GDL 06 - kgman (def. jrodimus in 4) - Jan'10GDL 07 - Carse (def. FlamingPavelBure in 7) - Jun'10GDL 08 - Freydey (def. Carse in 6) - Aug'11GDL 09 - TomKabs (def. Carse in 6) - Jan'13GDL 10 - swos - (def. IceStorm in 7) - Nov'13GDL 11 - Plabax - (def. Zalex in 6) - Jun'14GDL 12 - Freydey - (def. Plabax in 7) - Jun'15
GDL 13 - Plabax - (def. Zalex in 5) - Nov'15
GDL 14 - kingraph - (def. Plabax in 6) Mar'16
Plabax, Freydey, Zalex, swos, Carse, TomKabs...all retired by this point.