The irony is that Delphine lectures you about the Greybeards' "cult" because she says they're so committed to their ideology that they won't even help you defeat Alduin. Then she turns around and does the same thing.
That's as may be, but their bad experiences in the past don't excuse their present ideals and goals. It also doesn't make their manipulative attempts any more honorable or even nice. They don't try to kill Paarthurnax. They don't even volunteer to help you do it. No, it's "go do my bidding, svcker, and thanks for the new home, but you're not welcome back until you do just as we say". They don't by choice help you fight any dragon at all. That's very different from their "OMG, u r teh dragonborn we has waited so long, we luvs u" crap they had been telling you previously. Serve and protect the dragonborn my butt-tocks. Serve themselves, more like it

