In congratulating McCaw on his achievement, Henry said the skipper was inspirational for his total commitment to enhancing the country's reputation through the All Blacks' success.
"He is incredibly brave, skillful, and a hugely intelligent player who has the total respect of his team through the many deeds and successes he has achieved on the rugby field, and his ability to lead from the front," Henry said.
Almost 10 years after his debut, McCaw said of his century: "It's nice to have got there."
"It's pretty special, but I can't ignore the fact I've got to perform well for the team, that's the most important part," he added. "I'll reflect afterwards that playing 100 is cool to do."
Henry said McCaw will not play every game, meaning he'll likely be rested against Canada, New Zealand's last pool match before the quarter-finals. With the loose forward stocks depleted by the ankle injury to regular No8 Kieran Read, Henry said they will juggle the lineup to give all the loosies a rest.
"It's not good for him (McCaw) to play seven weeks in a row," Henry said.