The Powers of Condensation

One of the points we did not touch on Wednesday is why enthymemes are more powerful when condensed. Professor Schwab mentions this in reference to an example of an enthymeme from Bacon; he says that it is just as Aristotle had predicted in I.2.13. Condensation does not just produce a "better" enthymeme, however, it is also one of the requirements listed for a rhetorically adequate enthymeme. Why?