divergent thinker
rethinker
solver
problem solver
convergent thinker
problematist
divergent thinking
out-of-the-box thinking
addlehead
illogician
addle-head
loon
birdbrain
philosophizer
crackhead
game changer
underpants gnome
freeball
undeceived
disabused
originalist
bliss ninny
errorist
plan B
overthinker
have another think coming
fools rush in where angels fear to tread
rock
rejectionist
crank
speculator
practicalist
misguider
underthinker
brainstorm
counterplanner
forethinker
stretch
way out
idealogue
in a world of one's own
resurrectionist
in one's own little world
bury one's head in the sand
in another world
in one's own world
irrationalist
staircase wit
no plan survives contact with the enemy
josser
masterminder
doomist
metarealist
paralogist
practic
lock into
pragmatizer
sales resistance
antiprogressist
antiprogressionist
antiprogressive
concrete-head
illogically
rise above
nonrationalist
philosophiser
antioptionist
antirationalist
sponge
individualist
bien pensant
man of action
theorizer
space cadet
let slide
man of deeds
Daniel come to judgement
cross someone's path
suppress
improvisation
retrogressive
revolutionary
left-brainer
burn that bridge when one comes to it
gloomy
spacer
flat-earther
counterthought
anti
make a mountain out of a molehill
forward-thinking
short-termist
anticipant
dropout
antirational
anticipator
retrograde
antipragmatist
nonthinker