As to this, i've played on the transformation you're talking about (the sideways one) with four people, all fighting well, with no hits.Any semi-intelligent person will hit you into the cars. There's one platform, and it's too small to hold two characters at once, which means someone is going to get killed by either the cars or being forced to walk into Snake/DDD/Bowser's FSmash after they ftilt you off.
Also, although i doubt it is consistant, my friend was goofing off and found it easy to avoid the cars by spaming spot dodge.
being hit into hazards is quite possible on halberd and frigate orpheon, deffinatly more on halberd than on aero dive.
But yeah, it seems that most of the points brought up have been shot down.
I say we move this to CP