It was mad luck. I hardly failed anything except catches and pick ups, of which I made 3 out of 15 (all 4+ due to the rain). Rotters fell like wheat before a scythe but still the ball remained on the floor. I should've scored on turn 12 when I had the chance, but I wanted to stall out one more round just to really make sure the rotters couldn't catch up - that was enough for one of them to make 2 dodges and a GFI (with no re-rolls) to knock the carrier down, after which I couldn't pick it up again.
So here endeth the campaign, in the most frustrating way imaginable. Good luck to all the semi-finalists, I'll be back!