I like Coracle's approach in promoting one method for signing in as primary and having other options hidden behind a button or dropdown. The question here, would be what is the primary method that is best to promote? Is this just something that needs to evolve over time?
Discussion
I like how Habla's modal explains how things work and provides links to helpful resources, but it is a lot to parse in one go and may be overwhelming to users.
Also related, does it make sense to try and align on a particular logo & colors for recognizability when signing in? The value would be that users can see a common logo across apps and quickly realize, "Ok, I've used this before, I know I can log in here."