If you are a solitary practitioner you can initiate yourself in what ever way you wish. Magic is very personal and can betaken in many different aspects. After all if you so choose to follow another's way, you can also then choose to re-initiate yourself by the hands of those you have deemed to serve.
Kts; I think you may be right, but it is true that you can't initiate yourself into a group while being a solitary practitioner. If your practicing in solitude then their is no group to initiate yourself into.