Upaya & Tathagathagarbha

[Jikan]

This is a short piece I wrote with the intention of introducing the
concept of Ekayana to my practice group here in Washington, DC.

http://dctendai.blogspot.com/2011/01/what-is-ekayana.html

It is incomplete and a bit simplistic, of course. The very
interesting point to me is that in the Lotus Sutra, as well as in the
Srimaladevi Sutra, Ekayana is presented in the context of Upaya
(skillful means) and Tathagathagarbha (Buddha-nature):

-Tathagathagarbha is the Dharmakaya in the condition of confusion (and
the one vehicle or Ekayana is in this sense Buddhayana);

-Upaya is the situational teaching that shakes one loose from
confusion, and hence

-The Buddhist path or Buddhayana is ultimately a series of
contrivances or situations in which one realizes one's mind-nature as
Dharmakaya.

I'd like to know if there are ways in which this triangle is
complicated, recontextualized, or even contradicted elsewhere in the
canon. Thoughts?