I'm just gonna add this theory.
At first, I thought when Yuusaku's ghost(/hallucinations) appear behind Ogata, it's because Ogata wants to shot Asirpa and it "remind" him the result of his deeds.
But you could also think that Yuusaku's ghost protecting him from Vasily (he's already gone when Vasily reach the roof and I think he's not aware Sugimoto's group bring Vasily).
The fact that we never been showed Yuusaku's face I think it's related to Ogata's attitude towards him. So yeah we're still gonna have Ogata redemption arc. And it will include Asirpa.