Hendo will KO/TKO him.
Machida doesn't (shouldn't, I suppose anything can happen but this is highly unlikely) have the KO power to hurt Henderson, and he won't be able to avoid him the whole fight, either. Hendo will cut him off and get in his face from time to time, off and on, he will find a home for that big shot during one of these exchanges and it will be over.
“Anna, my strong, terrifying Anna.” -Cas
"You lack the requisite spine and testicular fortitude to study under me" -Elodin