Yup they're all streaky, that's why the playoffs is mostly about the right lucky cluster of hitters getting hot for the right two weeks, or about having a couple of guys step up if a couple of others fall off. '23 and '24 NLDS Nick Castellanos might be the greatest hitter in Phillies history. '23 NLCS, not so much. Don't really expect any of them to be enough if Harper and Schwarber struggle, but need one or two of them to augment Harper and Schwarber.
And of course when you are a great player your highs are higher than everyone else, and your lows not as low either. Schwarber's worst OPS month would still be second on the team right now [because Trea wasn't good in July, and invisible so far in August].