staircase wit
late to the party
belatedness
while the grass grows, the steed starves
mooncalf
retrodiction
moot point
overthought
overthink
overdue
divergent thinker
misplan
by the way
noodleism
brainstorm
think
try on for size
in haste
wrong end of the stick
a bridge too far
kick the can down the road
sloppy-minded
stretch
extemporaneous
let's roll
hidden agenda
proposal
late in the game
overwait
perish the thought
ideal
proleptic
thought bubble
contemporisation
bad joke
if, as and when
mysticism
underimagined
modest proposal
subscribe
miss the boat
preterrational
stale
push against an open door
inconsideration
rumble on
simmer
put the cart before the horse
invent
monoideic
brain cloud
a day late and a dollar short
contrive
slip
excogitate
formulate
ideogenic
delusion
forge
hallucination
ill-conceived
backward induction
gestation
devise
no plan survives contact with the enemy
on the wrong track
misassumption
lastminutitis
caprice
overplan
conceptualisation
ironically
planarization
premeditate
high time
demented
longtermism
idealist
conceptualization
formulation
out of time
divergent thinking
improvisation
presupposition
out-of-the-box thinking
out-of-dateness
plan B
forethought
assumption
overanalytically
prejudicious
hum and haw
inoculate
famous last words
prejudicial
have no idea
run with