You definitely can leave tenpins coming in behind the headpin, and by having the ball roll-out. What happens to the ball ideally is that it skids, hooks, hooks-out, rolls, and then rolls out. During the hook phase, there is still a little skid going on, otherwise the ball couldn't continue spinning in one direction and translating in a different one. You want ALL this skid to stop before the ball gets to the pocket.
If you have a copy of, "The See It, Feel It, Do It System," by Mo Pinel, there's a great description of this, better than one I can give. I believe Bill Taylor has written about it in BTM also.
--------------------
We call it a "solid 10" to make ourselves feel better.