I'm answering this from a more meta point of view so bear with me.
Can a character attempt to recreate such a power?
There's a couple of items in the Storytelling Advice inset in the V20 rules on p360:
So in a game where you have players that are interested in (re)creating new Disciplines a storyteller should allow it provided it is handled suitably well. The precise details depend on the circumstances but probably entail some sort of quest or lengthy research. Finding a teacher may be such a quest but independent development is not ruled out.
But how did those "teachers" first acquire them?
Once we allow that vampires can develop new ways to express their Disciplines we can extrapolate that other campaigns may have also done this, furthermore we can envision that the game writers and designers, when creating new Disciplines, have thought long and hard about how those Disciplines came about and tested them in their own campaigns (we hope).
Who were those "teachers"?
Another quote from the V20 rules applies here:
- Tell Them Everything: Much of the challenge in a game is in the
mystery, the parts of the story that you hold back for the players and
their characters to discover on their own.
The fact that the originators or teachers of these new Disciplines are not explicitly described allows the Storyteller to decide upon the availability of a teacher within the campaign. The search for a teacher can make for an interesting tale in and of itself or it can be handled relatively quickly. Watch the recent Marvel Dr Strange movie for an example of a quest to learn new powers.
The other issue is that, despite the large amount of background in each World of Darkness book there is simply not enough space to fill in every detail of the world, so even where a writer has a full story of how, when, where, and who developed a new Discipline there may not be enough space to include it. This is a good thing as it allows the Storyteller to build their own campaign world.
Where the originator or teachers of a Discipline are not explicitly mentioned in the source books it is up to the Storyteller to determine the availability of a teacher and how learning a new Discipline should be handled in game. This enables the Storyteller to work with the players for the maximum enjoyment of the game by everyone.