You misunderstand me, I'm not laying out a timeline for you, I'm simply stating the reasoning, more or less in a action-reaction order. The point I'm trying to make here is that yes, Gus was going to make billions with or without Walt, BUT Gus didn't want to work with Walt in the beginning. He thought he was irresponsible for working with a junkie (Jesse) and that alone crossed him off. But it was Gale who analyzed the meth sample and said it was marvelous, pure meth. And he persuaded him into hiring Walt not only because Gale recognized his superiority, but also wanted to learn from it. From Gus's perspective, he hired Walt to adopt his formula and make even more money than planned before. But from the very beginning he knew he doesn't want Walt long term and he tried to be as subtle about it as possible, even allowing Jesse to work with him and then turning him against him. Also, you got the loyalty thing mixed up - it was Mike who said to Jesse on the job that Gus "sees something in him" and that he notices his loyalty, but it's misplaced in Walter.