Titus Emanuel Day, 49, has pleaded not guilty to 50 charges including fraudulently embezzling money allegedly owed to Sebastian through royalties and performance fees.
He also denies 50 alternative counts of larceny, or stealing.
Peter Zahra, one of the most senior judges on the NSW District Court, suffered a suspected stroke after the Australian singer had taken the stand.
Judge Timothy Gartelmann announced on Monday that he would be taking over the trial and had familiarised himself with the evidence thus far.
Crown prosecutor David Morters SC continued asking Sebastian questions via audio visual link after contracting COVID-19.
The musician who recently recovered from coronavirus was taken to various royalty payments over the years.
One email expressed Day's concerns he was not receiving commission payments from one account that directly paid artists their fees.
"My understanding was always that Titus and his wife had full visibility, they were on the portal, they had the logins," Sebastian said.
"I was doing the songwriting ... the least they could do was send an invoice."
The Crown alleges that Day - who managed Sebastian via his company 6 Degrees between 2009 and 2017 - embezzled Sebastian out of almost $900,000 between 2013 and 2020.
But Day's defence barrister Dominic Toomey SC said his client has an answer to every single charge, and the police were perhaps "seduced" by the entertainer's high profile.
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