Eh, depends on just how bulky Cofagrigus can be (I've never used one).
Still, I don't think it's going to enjoy Adamant Banded max attack Brave Birds, as two I'd be more than willing to wager will severely dent it. Plus, Flame is fast enough as is at 126 base speed, can U-turn out etc.
It's a decent option I guess, but I really would't consider it a way to "stop" Talonflame.
You're much better off with a Strong Rock type (Barbaracle, Tyrantrum, Bulky Electric/Rotom-W, etc).
Even Mega Aggron and Avalugg can wall it to an extent with their massive defense stat. (Has to watch out for the boosting SD sets though).
And once the PBank is out, Heatran will wall Talonflame indefinitely.