I think it was more between flusha & olof that it could have been 50/50 as he has higher stats on those were olof was lacking a bit and viceversa.
I think it's a safe pick to have olof at #9.
Both f0rest & ScreaM had higher impact. ScreaM has been consistent for a long time, more than both olof & f0rest.
On the other hand, ScreaM & f0rest can be 50/50 aswell, as f0rest had 3 wins this year where he had a lot of impact (even MVPs), so I guess it depends on how many MvP & EVP ScreaM has. We don't know which stats are more impactful in they "IMPACT" calculation, so to me it feels more like a guess.
Personnaly I have ScreaM higher just because he had more consistency.