@Mr. WahIt's been verified that at least before this patch the just frame throw guarantee was changed so the loser wins in the event of both players pressing the button at the same time. Not sure when this went into effect, but current theory is since DOA5 vanilla version 1.00. If you remember, they fixed a "bug" where having the AI break fastest wouldn't allow you to chain your combo throws, this was because of the change in the draw result. So their fix was to have the AI break "fastest" as the "frame after fastest". In beta builds (v0.95 at Summer Jam) the AI wasn't able to break fastest if you just frame input the timing. Whether it has been patched in this latest (final?) patch, that remains to be seen if @WAZAAAAA can verify it when Steam gets the patch.
@Mr. Wah
I just tested it, still the same mechanic, but I've noticed something else that I previously missed during my tests, which applies to 1.02 too and not just 1.05:
If both players press the throw button at the same frame EVEN OUTSIDE OF THE FOLLOWUP WINDOW (which means earlier), the throw will break at the first possible frame! The "COMBO THROW" text won't even show in time. The So this is 100% wanted by the devs.