Hello,
I understand that it's not recommended to leave any input floating for the reasons mentioned here.
It's recommended to have pull-downs to ground for all unused inputs. This should be the same for the I/O if they're planned to be tri-stated as the inputs will always be active.
My question is, do you have any concerns with using a common pull-down resistor to GND for multiple unused B port I/Os?
Best Regards,
Brian