There are times when you would want to call the TO play, with all of it's normal blocking assignments, with a pre-ordained BB give. Two reasons mainly.
1. To make the DE commit to the dive and/or see how committed the DE is to the dive. You want the defense to see that you are totally committed to handing that ball to the BB, so they better honor it (not just a token look-in by the dive responsible defender).
2. You think the BB can get by that first guy, and so you beat him without even blocking him, everybody else is blocked on the 2nd level and there's a great chance it's off to the races.