Inbox keeps mail from people you emailed in the past year
Mail from anyone you have emailed in the past year stays in the Inbox. Spam handling and your own rules still come first.
If you have emailed someone in the last year, their messages now stay in your LeadLex Inbox. The reason shown is "someone you have written to".
Before, a real correspondent could land in Other just because Gmail had filed the message under its Updates tab.
Spam handling and your own rules still come first. Setup steps for the connection are in Connect Gmail.