Thank you for doing the legwork on this. I checked the references in
my BDF and found the index of citations to be incompete, but some of
these passages (not Mk16:6 though) are discussed in BDF:
$ 144 n. . . . . The nom. with IDOU ($ 128(7)) and IDE (e.g. IDE
hO AMNOS TOU QEOU Jn1:29 and often) is explicable on the
basis that these are frozen imperatives like AGE FERE
(IDOU is a particle already in Att.), a conclusion which
follows from their combination with the plural (e.g. IDE
AKOUSATE Mt26:65, AGE hOI LEGONTES Jm4:13; cf. 5:1, $ 364(2)).
. . . .
Section 127(7) explains that EINAI is omitted following IDOU and is
a Semiticism on the model of Hebr. HINNEH, Aram HAH.
-- Stephen C. Carlson : Poetry speaks of aspirations, firstname.lastname@example.org : and songs chant the words. http://www.mindspring.com/~scarlson/ : -- Shujing 2.35