Same here. Backus wasn't great overall but last year he played well. Huge blow to the line.
Now Detroit has to draft OL, and I worry that Fisher is gone at #5.
Maybe. There's a lot of tackles projected to go second round. Guard is far more shallow. I'm a bit more concerned by the lack of players at DE right now.
The Lions have Reiff, Fox, and Hilliard who can all play tackle, along with Nagy and Austin for guard. I don't really have any idea what to expect from any of them, but they at least exist.