Thanks for this.
I'll be back for a more complete read later on, but I believe Avios earned at avios.com are not covered in the summary.
They are effectively interchangeable with BA and IB Avios but can offer different availability. I recently redeemed a Reward Flight Saver in G class at avios.com when there was no corresponding X availabilty at ba.com. (No Avios or TPs earned, though.)