Sad to say, this was the only part of the entire MQ that made my jaw drop in a big "HUH, where did that come from?"
Ok, cool, the 2 Blades show up for the cease fire conferance and speak up to convince everyone that a cease fire was needed to help me "Capture a dragon" mind you... Then while all the Jarls and people are talking amongst themselves after the conferance I had to strain to hear what Delphine says clear across the room. So when I approch her she says it again and I'm like "what the hell?" So in inquery I got the message, either kill Parthurnaxx or we won't help you...
Beforehand, I agreed to find more people to recrute into the Blades, I recruted one person before the conferance... (Beat the crap out of Delphine with the mindset of "Don't you ever give me an ultimatum and tell me what to do" Of course she couldn't be killed) So I reloaded and proceeded hasteningly to complete the MQ.
Well, didn't need the Blade's help after this conferance, but still I brought another follower to recrute AFTER completing the MQ... "Thanks, I think one more should do it and then we will be strong enough we can go out and slay dragons" she tells me... Whats funny is, one of the followers I brought was my housecarl from Whiterun, now she sits in my house with Blades equipment on...
I never did bring a third follower, never found out exactly what the Blades would do once I did, never killed Paarthrunaxx(Mostly because I don't know if there is another way to "Meditate" on my shouts AND because "The Blades told me to" thus, I never found out EXACTLY what the Blades would help me with once I killed Paarthrunaxx.
All this being said, I agree, the entire scenero could have been written quite a bit better, more thought, more feeling and more reason than "For justice of what was done thousands of years ago"
Dummies, you already helped me BEFORE you found out the Greybeards are harboring a Dragon

Now I don't need you any more.... IMO, I think more went into the engine dynamics and visuals of this game while the storylines were hastily written... Needless to say, some of the books of Skyrim are quite a bit better than some of the storylines...
But, I've enjoyed the game thus far, put in over 100 hrs with my first Character and just started a Battlemage
(I love how the editor messed up my paragraphing!!! I edited a 'cuss' word lol)