Originally Posted by
WR Cage
To confirm, the OP had the aisle, the footrest user had the middle, and the window seat was occupied by another individual.
If the above is true, then only the window seat user can raise the safety issue, not the person in aisle seat.
The companion cube can still pop out and hit anyone in the head.
But in a situation where an inflatable companion cube would get airbone, there would be many other things airborne to worry about.