A 144

The tiny creature can walk through the Wind Wall, though there may be an issue with carried items. Creatures of size Tiny are only barred from passing if they are flying.
Tiny and Small flying creatures cannot pass through the barrier.
Solid objects may intrude into the space of the Wind Wall, but the spell description does not describe the effect as being either supportive of, or broken by, such objects. Absent such description, the spell functions as stated despite these objects intersecting its space.

A 145 N/A

This question cannot be answered, because there is no "10 foot gap created by the wall".

A 146 No.