it's 4th season not 3rd. season 7,8, and 9 basically had all the same meta.
End game groups
Season 1, 2, 3: 2x M6 DH with a lock down WD
Season 4: Lightning monk
Season 5: DMO Twister
Season 6: Tals Twister
Season 7, 8: H6 Firebat, and R6 Gen
Season 9: A6 Firebat and R6 Gen
Solo meta Shifted in Season 9 though.
sader: LoN bomb -> Hammerdin
DH: LoN FoK -> M6 Grenade
Wiz: Firebird archon -> Lightning Archon
Barb: BT charge barb -> WW barb (with istavans set)
Monk: R6 gen -> R6 gen (without epiphany)
WD: Helltooth Garg -> A6 Firebat
2