Board Thread:Lore Discussion/@comment-24098614-20150903093108/@comment-35782287-20180809000724

I was a die-hard Blade until the Paarthurnax sidequest came up because the Greybeards seemed like they didn't want me to kill Alduin.

After Esbern told me my dragon friend had to die, I ignored them and continued learning Shouts from the Greybeards. I didn't completely destroy my relationship with the Blades.

I suggest to just ignore the Blades when they tell you to kill Paarthurnax.