Police said Mr Sinke was struck and rendered unconscious after an "altercation" with a man at the Sub Culture nightclub about 3am.
At Dunedin Hospital, surgeons had to remove a bone flap to ease brain swelling and Mr Sinke was kept in an induced coma.
His father, Richard Sinke, said yesterday that his son was being brought out of the coma and was responding well.
"They've taken the sedation off him now, which means he is becoming very alert. They are also reducing his other medication. He is becoming aware of his surroundings and where he is. I wouldn't say he is coherent, but it means he can start functioning more.
"He keeps touching his head where they've taken the bone flap. It's a 10x12cm bone flap."
The extent of his son's injuries was not yet clear, nor is the long term prognosis, Mr Sinke said.
"They will assess him further in terms of how much he's been injured. We're hopeful it's not much. But they still have to assess his speech and movement."
Jordan was moved from the intensive care ward to the high-dependency unit yesterday.
"The HDU is still pretty intensive, though. But it's good if they can move him there."
Jordan Sinke was at Sub Culture to farewell a friend off to Australia to work in the mines.
Witnesses told police he was standing near a bar close to a door to the nightclub's games room. Seconds later, he was unconscious.
Police would not be drawn on the specifics of the alleged assault.
Richard Sinke did not want to comment specifically on Dixon, but was glad of the arrest.
"It's a minor relief to us, but our focus is on Jordan.
"Just that Jordan has come out of the ICU and he is improving - that's the biggest joy for us," Richard Sinke said.
Dixon, who told Tindall via a YouTube video that his behaviour in New Zealand was "unbecoming", did not return calls yesterday.
Detective Matt Jones said the arrest followed a week-long investigation during which officers took statements from about a dozen witnesses.
They hoped to talk to Jordan Sinke when he was well enough.
They still wanted to hear from anyone else who saw the incident or had information about it.
Dixon created headlines after putting on YouTube security footage of Tindall at Queenstown's Altitude bar, where Dixon worked as a bouncer.
He was fired from his job and charged with accessing a computer system and dishonestly obtaining video surveillance footage.
He has denied the charge.
