So far in Valorant there has been 14 grand finals and igls have shown bad performances in most of them. Out of 28 igls that have played in grand finals, there was only 7 times igls went positive. So lets take a look at their KD:
2021:
Shahzam: 65/50 (+15)
Boaster: 52/61 (-9)
Redgar: 51/47 (+4)
FNS: 32/61 (-29)
Redgar: 59/68 (-9)
Zeek(?): 74/75 (-1)(Idk really who was the igl)
2022:
Saadhak: 50/61 (-11)
FNS: 43/54 (-9)
Benkai: 53/73 (-20)
ANGE1: 70/75 (-5)
Saadhak: 65/63 (+2)
FNS: 45/68 (-23)
2023:
Saadhak: 65/86 (-21)
Boaster: 75/74 (+1)
Boostio: 46/52 (-6)
Boaster: 34/43 (-9)
PRX(no igl but probably forsaken did the most work)
Forsaken: 54/67 (-13)
Boostio: 62/67 (-5)
2024:
Munchkin: 71/73 (-2)
Johnqt: 70/67 (+3)
Boo: 61/69 (-8)
Munchkin: 56/58 (-2)
Boo: 58/78 (-20)
Nobody: 59/69 (-10)
2025:
Valyn: 94/82 (+12)
Stax: 82/84 (-2)
Boaster: 41/71 (-30)
Forsaken*: 81/75 (+6)
If you only count true igls and not the team effort callings you should remove Shahzam and forsaken from this list and there would be only 5 igls that went positive in 14 grand finals total. So in average only 1 igl goes positive in a grand final per year.
Also valyn is the only igl that went positive in the grand final and lost. Let that sink in. It must hurt even more as a G2 fan after knowing that.