The only problem I have with Odium being reinterpreted as Passion is Passion also implies desire in a form of compassion, which is covered by Devotion. Now, if we view Odium as Destruction, "Passion" makes more sense, as the Unmade, which would line up with Odium's intent, seem to line up with destructive acts/desires (Ashertmarn being destruction by excess, etc.).
Long story short, T could be able to almost "change" Destruction to a more noble purpose, almost like he had another shard to temper it.