This year Thomas and his family made a decision that may well set him on the path he cherishes to Olympic glory.
He won a scholarship to attend the prestigious swimming school at Toowoomba and left his family, friends and familiar life in Christchurch to board at the school.
The personal cost has been tough to bear, as he admits to homesickness and missing his family and friends. But the development in his swim times has been dramatic, highlighted at the Queensland Short Course champs when he beat the best young swimmers in Queensland to win gold in the 200m backstroke, plus he won silver and bronze medals.
"I found it hard at first but then I got used to it after a while," he said. "I come home every holidays so that helps.
"My swimming has improved a lot, I am training more and it is a lot harder. I have now swum 26sec for the 50 freestyle, which is pretty fast."
Mark Wilson is mentoring Thomas at the AIMS Games and rates his young charge highly.
"His height helps as he is a very tall boy. He swam for New Zealand Juniors and each of the last two years he has got seven gold medals," said Wilson.
"It helps the school does the swim programme in Australia as here it is the clubs. Everything is based around the swimming at his school. Competition is very tough over there."