I personally really rate both Jack and Mitoma. For that reason, I would love to see Mitoma playing for us, but we have a few other priorities, and Brighton might ask for silly money. 100m would be outrageous, and we will have to spend probably close to 200m for two centre mids already, plus Gvardiol and maybe even a Kyle Walker replacement if he was to leave as well. That's a lot of changes, so Mitoma seems unlikely for now. If we have the money, I would rather pay slightly more for Kvara since he is younger and probably with an even higher ceiling.
Haivng said that, in the future we need to look for guys like Mitoma before they are worth big money. We seem to have a good scouting network in South America (Alvarez, Perrone), but I think places like Asia are underrated for talent, and Mitoma is just one example of that.