The pool mines some GIN blocks among others. You get a % value (converted to BTC as that's how the pool works) based on the exchange rate.
Coins get sent to be exchanged and divided among people whom have a % share.
BTC returns from the exchange; and are divided among the miners.
Since you want to be paid in GIN; you wait for GIN to get mined to cover your share. When they are mined and given to you; their value is based on the previous sale.
This is how I understand the process to work. There are more variables at play when it comes to mining something on a multi pool because this is not a solo mining pool.
You are taking an estimate (4.9GIN) and treating it as an actual value.... which it is NOT. It is an estimate. If it was an actual value, it would have said 4.4; but since that can't be determined until the BTC returns from the exchange, its is called an estimate.
As I said, i mined 4.9 GIN from GIN blocks, its not estimate value, it is a sum of rewards per blocks. The only explanation i have is that GIN coins i mined at first sold and than bought back with 10% higher price. And it is super ridiculous.