I will say that he takes his sweet time to show up on occasion though.
Then that's BS he takes longer cause hes at the ToW. BS.
I was in Whiterun and damn near Riverwood, close enough to the summit. Took him FOREVER to finally arrive. Dragons already randomly attacking Whiterun AND COMPLETELY ignoring the hell outta me. During this time is when 1.2 first released.. and for the LONGEST Dragonrend would not work, at all. I hit him everytime and he just shrugged it off like nothing. NEVER landing.
That's why I eventually called Odah, he's a beast and the only Red Dragon in the game. lml
He's definately more of a help then Call of Valor. That's for sure...