Here is a great additional resource for the Dave play: a copy of the 2002 OSU playbook. Though outdated in some respects, the Dave diagram and rules hold as true today. The playbook gives the rules for each position and diagrams the play against nearly every possible defensive combination. Well-worth the read.
One will note, however, that this playbook does not contain the Dave rollout keep or play-pass, demonstrating how these were a nice adaptation by the coaching staff last fall.