Joseon is what I meant, thank you. And I put the "could" in place with the latter because it is a possibility, not a certainty. While Joseon trade can go through China there might still be trouble with the Qing that could prove troublesome regardless that could slow or stop it, making Japan's position in the country disproportionate with time.
Again, it's unlikely that the Qing would exist if the Imjin War did not occur, and given how Joseon continued to send tribute and establish stable diplomatic relations with both the Ming and Qing, I find it hard to imagine a situation in which China would strain this balance. While Korea would potentially have a significantly larger area and population depending on the potential conflict with the Manchus, it would not think about antagonizing China, as doing so would cause it to lose a major trading partner, along with severing diplomatic relations and a potential invasion. Given how the peninsula's population either doubled or tripled around 1550-1800 due to the introduction of cash crops from its neighbors, the trade was certainly extensive. As a result, while Japan's influence might increase overall, China's presence would still be retained to a certain degree.