Before the collab Phainon had 21.61Gs. The warp tracker site has the following numbers
Phainon: 10,107,503 warps
Sparkle: 639,394 warps
Sunday: 2,422,217 warps
Tribbie: 2,939,228 warps
Total Warps Combined =
10,107,503 + 639,394 + 2,422,217 + 2,939,228 = 16,108,342 warps

So now we calculate each character's proportion of warps and apply it to the total sales:

Phainon:
(10,107,503 / 16,108,342) × 21.61 ≈ 13.56G
Sparkle:
(639,394 / 16,108,342) × 21.61 ≈ 0.86G
Sunday:
(2,422,217 / 16,108,342) × 21.61 ≈ 3.25G
Tribbie:
(2,939,228 / 16,108,342) × 21.61 ≈ 3.95G

So Phainon managed to get 13.56G at most probably way less since this isn't taking into consideration Firefly's skin sales
As a reference Sunday's release got 12.81G