If you looked at the first credit roll, you will notice that three voice actor did the voices for the Liquid/Ocelot characters. For each of these characters:
1) Liquid Ocelot
2) Revolver Ocelot
3) Ocelot
I guess the third is the voice of the young Ocelot from MGS3.
Here is a question, did Ocelot take Liquid's hand to begin with or was this part of the act? When he takes his coat off during the final battle, you can notice the different color of the whole arm (and not just the hand that Grey Fox amputated).
Also, the way FOXDIE works here is different. In MGS1, everyone dies of a heart attack, which is not the case here. According to Big Boss, Big Mama & Ocelot (and Himself) died because of FOXDIE... but how?
Speaking of which, I laughed real hard when Liquid Ocelot faked death from FOXDIE after you beat RAY 
No foreign sky protected me,
No stranger's wing shielded my face.
I stand as witness to the common lot,
survivor of that time, that place.
- From 'Requiem' by Anna Akhmatova
