Bent Frame, bent k member

Jim Lusk said

Putting the car on a frame machine should straighten out the k-member, or get it close. I have straightened one k-member that was REALLY bad and a couple that were slightly tweaked. It should be easy with a frame rack.

Click to expand...

So I should call back the body guy and tell him to leave the k member bolted in and straighten it all up? I don't want to come across as a know it all jerk on that phone call. If he wanted to drop the k member to straighten the frame, is that just the best way to do it, and it'll be fine if I give him the green light to make it good enough instead of best?
Obviously every body guy is different but just trying to get a feel for it