No. BUSINESS card accounts do not increase the 24 month count. (Chase business card applications are nonetheless subject to the 5/24 rule.)
Holding an AU card on another per's account is irrelevant.
Most issuers will not upgrade or downgrade a new account during the first 12 months.
Yes
I knew that Biz accounts didn't count towards 5/24 but I thought Chase Biz accounts did for some reason, I appreciate the clarification.
Good to know about the upgrading and downgrading within 12 month thing, probably just app for the CSR since I will be planning on actually keeping the card long term.