I wouldn't set much store by CPL or Saudi, not because they're nascent and with possibilities, but because, I fear, these million dollar gold rush will just be that for players in their twilight as a paid retirement homes that help these leagues improve their Merch sales or IG following, or discards or averagers in a competitive country like Brasil. I'm not completely negative about the influence of top stars in career twilight zone inspiring a new gen in these leagues to raise standards. But China hasn't thrown any surprises in spite of a decade of superstar players. However, the Brazilian League should be an interesting challenge. We already have Argentina and Mexico. Why not Brasil? I know,it's a huge task to feed in datasets, genrrate fresh algorithms etc... but slowly slowly sooner?
And yes, if there's an added option under Manager Options for the Gaffer to on and off swap 1st team for Reserve and back, with Reserve Manager, that'd help getting cohésion and transitions of players.