Gabe has all the knowledge of a complete Half Life 3. He has been losing weight, which in sense he is shedding his essence unto the world (mainly as sweat back into the atmosphere).

Soon his essence will flow through us, each having a little knowledge of the complete game. When the time is right, we will come together and make the game.

Gabes last gift to us, is us making the game.

>>716167258 (OP)
No dude, his last gift will be fully interactable virtual worlds thanks to brain interface chips or some shit like that
He will pull it off, I believe in him