Sometime that's the problem with text/post no one can really grasp fully what other try to say.

In any rate, if you drop the pan and refill, the kit is all you need. You can't drain the torque convertor w/o dropping the tranny or using some sort of extractor (machine to recirculate etc). So you don't need 10-quart.
Unless (again reading between the lines) maybe you are thinking about replacing the filter/pan and on later days do another drain and refill.

Yep, Klaus is the guy coresponding with me, at least that's the signature on the email.
Alot of auto-industry nowadays, prefer text/emails instead of phone as form of communications cause many of them operated by 1-2 front employee/sales sitting on top of a big warehouse. That's how they pass the saving to us, it's a competitive world this auto-parts online business.