Possibility:

Vito rapes Finn in a "violent" scene. While fighting back, Finn does the damage to Vito's eye that we see in the leaked picture? Stabs him, cuts him, pokes him, who knows. It looks like one hell of a nasty injury though.

My question is, would Vito let Finn live to tell this tale as well? He already told about the construction site incident.

Or, could Vito say Finn attacked him, did the damage to his eye, so he killed Finn. So Vito is the victim in that case. But the only problem with that is, what reason would he give as to why Finn attacked?

Just speculation.