I don't think Chad Clifton ever practiced either. Bak is gonna be fine and I predict he starts 15 games and is rock solid.
Pretty sure Josh Sitton went through the same thing late in his career. Guys like Bakhtiari can pass block in their sleep. As long as he can maintain his conditioning, he'll be fine.
Ring the bells that still can ring
Forget your perfect offering
There is a crack, a crack in everything
That's how the light gets in - Leonard Cohen