LOS ANGELES — It seemed like conventional wisdom that Eric Haase would be the odd man out when Daniel Susac returns from his rehab assignment, giving the Giants the catching tandem, with Jesus Rodriguez, that Buster Posey envisioned when he traded Patrick Bailey. Not so fast. Haase made about the strongest possible case to remain on the roster — with San Francisco’s two young catchers — on one of the biggest stages there is for a Giants player. Giants catcher Eric Haase celebrates with shortstop Willy Adames after hitting his second home run against the Dodgers. Jayne Kamin-Oncea-Imagn Images The journeyman backstop, who was cut in spring training and initially opted out of his deal, homered twice in the Giants’ 6–2 win at Dodger Stadium — and came a few feet short, or a few hours late, of coming up with a third with a fly ball out that sent Andy Pages to the wall in center. “If he hits that ball to center a little earlier in the day, it’s a homer,” manager Tony Vitello said.…