Hell I don't even have to use Saikoroshi as an example of seperate canon as it doesn't make sense for Bernkastel to be actively solving the mystery in Minagoroshi ages before she's born in sotsu.
>>49967724
Another example of contracanon, they literally kill themselves after that.
>>49967719
This is the complete opposite of them going separate ways/abandoning in St.Lucia. Rika literally leaves Satoko to get new friends in your beloved Gou.