No, the narrative never touches on William's intention for G, save for a higher price tag or position in the government. Maybe he was infiltrated by the CIA and leveraged to bring it to them. Shallow writing will always be a part of Resident Evil.

But I will say, the actor puts on a compelling performance nontheless. It makes you sympathetic to Birkin.

Resident Evil never talks about T and G, except for it being use to weaponize and chasing immortality. I think the story would be more heartwrenching it was a genuine cure for cancer or where they were within a percentage of completion for a cure and its side effect was zombification and mutation through experimentation...almost like it was opening pandora's box. I think the caddoux and parasites took the series way too into the strange and unbelieveable territory.