So long as Hanson and Lanterman are discussing the esoterics of anhedral, thought I'd throw two cents in.

Decalage is totally independent of stabilizers, angled ot not. Decalage applies only to airplanes with two or more main lifting surfaces, biplanes, triplanes, etc. It is the difference in incidence of the upper and lower wings. Stab incidence is NOT referenced by the word "Decalage."

My twins have no decalage, but they inspire much badinage.
(Now run for your dictionary.) (Haw.)(Look up decalage too.)

Bill.