Paul Rex was deposed on day three of the ongoing trial at Westminster Magistrates' Court in London to determine whether the 61-year-old businessman can be forced to return to India to face charges of fraud and money laundering allegedly amounting to around Rs 9,000 crores.
Mallya's defence counsel, Clare Montgomery, today sought to back up her opening arguments that the Crown Prosecution Service (CPS) on behalf of the Indian government had failed to establish a prima facie case of fraud against her client.
While the CPS stand is that Mallya did not intend to repay the loans he sought because his airline's demise was inevitable, Montgomery is trying to establish that Kingfisher Airlines was suffering from consequences of a wider global financial crisis around 2009-2010 and that its failure was a result of factors beyond the company's control.
Going over parts of his written witness statements, the banking expert pointed to an appraisal in February 2012 by SBI presented to the Reserve Bank of India (RBI) on the Kingfisher Airlines loan, seeking its recategorisation from "sub-standard" to "standard".
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Their assessment at this time is "quite straightforward", that despite facing severe constraints every effort is being made by the airline including an infusion of substantial funds, he noted.
"SBI is the largest bank in India and one of the most reputable...If it was another bank, I would take note of the fact that SBI had supported a business in a positive way," Rex said.
Indian government sources have described the CPS case as "very strong" and claimed they remain confident that based purely on the "merits of the case" and "documentary evidence", an Indian government victory is assured.
Mallya, via his legal team, had claimed earlier in the week that the case against him was "politically motivated" and that it was being used as an opportunity to make "political capital" by the ruling BJP as well as Congress and Shiv Sena.
She claimed that much of the material was questionable and there were at least a dozen documents submitted which read like an identical "template".
The judge has asked both sides to submit a document laying out the factors for and against the admissibility of the evidence submitted by the Indian authorities by the end of this week.
But government sources have asserted that the evidence is based on a set template but the content within the documents cannot be described as a "template".
The prosecution's case rests on "three chapters of dishonesty" by Mallya misrepresentations to various banks to acquire loans, the misuse of the loans and his conduct after the banks recalled the loans.
"Instead of acting as an honest person and doing what he could to meet his obligations, he sets about erecting lines of defence," CPS counsel Mark Summers told the judge.
The hearing today, took place over some "interruptions" while Judge Arbuthnot attended to other cases.
Rex was the second defence witness to take the stand, following aviation expert Dr Humphreys, who had been brought in on Tuesday to support the defence argument that there was no intentional fraud involved in the default on bank loans by the then struggling Kingfisher Airlines.
Mallya, who has been based in the UK since March 2016, was arrested by Scotland Yard on an extradition warrant in April this year and has been out on bail on a bond worth 650,000 pounds.
If the judge rules in favour of extradition at the end of the trial, the UK home secretary must order Mallya's extradition within two months. However, the case can go through a series of appeals in higher UK courts before arriving at a conclusion.