Hi Andrew. I am working on a more sophisticated model and hope to post about it. But this model will take a lot of time to put together - I am guessing a month, so it may not be useful to folks who need to make a decision about entering another marathon soon. London is a quirk with both the 2022 and 2023 races feeding Boston 2024 but note that Tokyo did not have any international runners in 2022 to feed Boston 2024 but plenty of them in 2023 to feed Boston 2025. Which way does all this move the needle? Not sure yet but it is the basis of the work that I am currently doing on revising my analysis.