>>718310804
Valve has always wanted to have an Alyx-based HL game since HL2 I believe. Gabe talked about HLA since the 2000s as far as I can tell and there was supposed to be a HL game with Alyx and Dog on an adventure. As for Gordon's last role in HL3, I just hope it won't end with Gordon dying. Epistle 3's ending with Gordon teleported to an unfamiliar shore in a Portal 2-esque ending is a rather fitting closure for him.