Monday-morning quarterback
misplacer
overshooter
misteacher
understatedly
belittler
misidentifier
underfunder
misdirector
misspeaker
wronger
misrepresenter
freefaller
underproducer
irreligionist
oversharer
undercooker
underpuppy
forewarner
diminisher
misbehaver
overcommitter
blunderer
disregarder
unsympathizer
nonsympathizer
mishearer
underpropper
curtailer
distortionist
overreacher
misreader
overtrader
unequal
unentangler
counterrespondent
undercutter
overindulger
expugner
misfirer
underguesstimate
disinheritor
underfunctioner
mishandler
undershoot
overreporter
mislayer
disprover
impeder
misappropriator