Stupid questions about Hemis

How come the Ram's Hemi drops to 4 cylinder mode and the Chrysler 300's only drops to 6 cylinder mode? Doesn't that seem backwards? Another stupid one. Why haven't they built a 6 cylinder Hemi? (Like for the Dakota and Jeeps with the 4.7L?) I also don't understand why they don't offer a bigger Hemi for the Ram 2500/3500. The Cummins takes a lot of driving to "break-even" on.
Author: Walkercolt