When the Marines propose an idea for engaging in the Western Pacific, it's important to note that they're not doing so to benefit the overall American strategy in the region. They're trying to see what will benefit the Marines. Everyone is well aware that any conflict in the Western Pacific is going to be a naval and aerial affair. Ground troops aren't really going to be be involved and this means that the Marines (and the US Army) don't really have a job. This is them trying to insert themselves into the operation so that they're still relevant.
If the US was serious about competing, they would've folded the marine corps into the navy like normal countries do. The original justification for marines as an independent branch is centuries out of date.