> Kanye strikes me as a classic narcissist, he likened himself with a messiah and so on. While at the same time I trust the leaked diagnose he actually received as bipolar.

Delusions of grandeur are a common symptom of bipolar mania. His diagnosis explains everything. If he's experiencing a manic episode now, it's hard to draw any conclusions at all about his baseline personality (which may in fact be narcissistic).