To me it sounds like you assume 'in the keg' means "ready to drink at peak flavor"...and that's not the case.
I've listened to a lot of Jamil Show and I don't get the impression he rushes from brew day to drinking time, but rather kegs and lets it age there to keep primary and secondary open for more batches.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10