Well you're in luck…

Michael Green is a talented writer (most of his resume is made up of solid TV shows) who is one of four credited writers for Green Lantern so why don't we let him write it before dismissing him?

That's because it wasn't entirely. The creator said it's actually an inside joke thing

I'm convinced that Ted/Robin has been the endgame all along and that Ted's story to his kids is how he met their biological mother.