One thing to note is that all of those teams tend to have slightly unique approaches to pitching dev.
Rays = market inefficiency demons, always hunting undervalued arms or unique arms
Guardians = do this weird thing now where they target college pitchers, draft them at good value, and then make them better
Yankees and Dodgers = wield their oversized treasuries to buy assets/talent and employ other humans to shape/develop the humans they own
Astros = really good at being on the cutting edge of pitching theory. and at cheating.
Toronto needs to find a niche....