How rather curious. I investigated some of the unused items in JORG and found differences with their post-JORG counterparts.
Online Mode Items
X-Potion
JORG: Restores 500HP.
Post-JORG: Restores 150HP.
OI3
JORG: Elixir effect.
Post-JORG: Restores 150HP.
Phoenix Pinion
JORG: Same effect as "Single Player" Phoenix Pinion. Vincent is revived upon KO, but only with 20% of his max HP.
Post-JORG: Restores 150HP.
The bigger discrepancy here is that in the initial release, Phoenix Pinion spawns an icon in the bottom left corner like that from the Phoenix Down, except without a halo. In post-JORG, the Phoenix Pinion spawns a skull.
Icon for Phoenix Pinion effect in JORG:
Icon for Phoenix Pinion effect post-JORG:
Icon for Phoenix Down effect:
If you have used a Phoenix Pinion, no matter which version, and then proceed to use a Phoenix Down then the icon for the latter will replace the former.
The item description for the Phoenix Pinion is that you only have a 50% chance of revival, despite that the actual effect is a 100% ensured revival but with only 20% of your total HP restored.
I previously made sense out of the skull icon by linking it with the potential doom highlighted in the item description, but I'm leaning more now towards the idea that this icon represents an unused Poison or Doom effect. Hopefully I'll find more solid data on this eventually, like for example unlocking an actual unused status effect.
OI6
JORG: Same effect as Hero Tonic, which grants invincibility for 10 seconds.
Post-JORG: Restores 50MP.
OI7
JORG: Same effect as Hero Tonic Gold, which grants invincibility for 20 seconds.
Post-JORG: Same effect as Limit Breaker.
The item OI7 was my initial motivation today for revisiting these items. I wanted to see if the OI7 "Limit Breaker" worked on Vincent in JORG, but instead it only works as a Hero Tonic Gold. The "Single Player" Limit Breaker item doesn't exist in JORG. Its equivalent item ID in JORG is the unused item "
SI27" which can't be used for anything.
Ergo, I have no way of testing out a "Limit Breaker" on Vincent in JORG.
OI8
JORG: Can't be consumed. You will not even get an "ERROR" sfx from trying to use it.
Post-JORG: Vincent is turned into a living grenade! Upon use, Vincent gets stuck in whatever animation he is currently performing. After five seconds, Vincent flies into the air as though something exploded, causing damage to both Vincent and his surroundings.
OI9
JORG: Same non-effect as OI8.
Post-JORG: Vincent freezes in place and will typically only be released if he is melee'd by enemies. I speculate that this is a remnant of the "S-Mine" item since it locks Vincent in place, but without having an explosive effect intact.
OI10, OI11 and OI12 act the same as OI8 and OI9 in JORG.
Post-JORG,
OI10 restores 150HP, just like a Potion in the online mode.
OI11 and
OI12 are represented by
gold/
gil icons, while their JORG equivalents have the standard "usable item" icon.