Okay!
I think I know what I did wrong, kinda, so V.03 should remove the weretiger from the party.
Unfortunately, This has fixed Lionel's abilities for normal fights after transforming but has brought a slew of new ones.
Firstly, while I now have the correct abilities and stats in following battles, the game still says that I have the Weretiger instead of Lionel and that he appears as the Weretiger in battles.
Next, in case of a cutscene, the character model completely disappears and if a fight occurs after the cutscene the fight breaks as in the image below.
On top of this, the first problem wasn't limited to Lionel but also included Yurlun, perhaps I should have been a little cleared about that.