Oh man, yeah, it's exactly like that - You cannot predict something that is inherently unpredictable.

And as much as I disliked Balthazar, I think he's actually the only angel to ever wish the boys Godspeed. I don't remember even Cas saying that to them.

Yeah, it's almost a throwaway line, but I really liked him for it - it kind of endeared him a bit more, and also was a very slight reminder about who these beings are.