What about Guerilla Games then? They only have around 270 staff (a third of Bungie's staff), in the last five years or so they have not only developed two games, the latter of which (HZD) is stunning, they have also developed an industry leading game engine. Or EA DICE? A similar number of staff to Bungie, over the last five years or so, they have developed BF4, Battlefront I, & II Battlefield 1, and an industry leading game engine.