Tarrin is in damage-control mode, assuring the public that he would fully investigate Krung Thai's non-performing-loans.
Government spokesman Akapol Sorasuchart points out that Tarrin did not name Sirin to Krung Thai.
" Tarrin insists he has "been quite thorough in explaining things to the public.
The decision was Chuan's, but an angry Supachai concluded it was at Tarrin's behest.
Tarrin has been universally lauded for stabilizing the baht and halting the slide into financial chaos.
He held Tarrin responsible for nixing the session, and went public with his radical proposals anyway.
The suspicion now is that Tarrin was trying to cover up for his brother, a charge he rejects.
Shasukat Tarrin, who headed Citibank in Thailand until two years ago, now runs Habib Bank, Pakistan's largest financial institution.
"Tarrin doesn't look at macroeconomic policy, " says Surakiart Sathirathai, a leading economic adviser to the Thai Rak Thai Party.
Right now, the avuncular Supachai, 52, is losing out to the diminutive, flinty Tarrin, who is a year older.
Tarrin, however, secured a deal to report directly to Chuan and bypass Supachai.
"I'm aware of the danger that complacency will make it harder to push through reforms, " says Finance Minister Tarrin Nimmanhaeminda.
Given the gravity of the situation, Supachai - though uneasy with Tarrin's moves - kept quiet and focused on boosting exports.
Tarrin is also moving to place the bank directly under his ministry.
Tarrin's emphasis on banking has critics carping that he failed to pay due attention to other sectors, including small businessmen and farmers.
Tarrin remained in the driving seat and Supachai's attention shifted elsewhere - namely to his campaign to head the World Trade Organization.
Tarrin, rightly or wrongly, has become a target of this swelling discontent.
Even Tarrin's record in the banking sector is a subject of contention.
Yet it had all started so promisingly for Tarrin and the Democrats.
The duo are Finance Minister Tarrin Nimmanhaeminda and Commerce Minister Supachai Panitchpakdi.
Tarrin says the key steps are to rebuild confidence in the financial system and ease the tight liquidity to improve prospects for businesses.
The abrasive manner of Mr Chuan's finance minister, Tarrin Nimmanahaeminda, has also made it easier for opponents to attack the Democrats' economic policies.
Chirayudh, who has been critical of Tarrin's handling of the economy, faults Sirin for overzealousness in turning Krung Thai into a successful commercial bank.
Abhisit Vejjajiva, a minister in the PM's office, dismisses such talk and maintains that Tarrin and his team did their best under the circumstances.
Two years later, when the interim regimes had proved their ineptness and Chuan was returned to power, he proudly brought back Tarrin and Supachai.
But the fickle Thai press, which had only weeks earlier voted Tarrin "Man of the Year, " rounded on the finance minister and his boss, Chuan.
Thailand's economic data indicates that Tarrin has met with some success.
Whatever happens, golden boy Tarrin has clearly endured an unpleasant spell.
Mr Tarrin's oversight of the banking industry has left him vulnerable.
Chuan, though, has a big asset in his economic team, in which Tarrin Nimmanhaeminda returns as finance minister and former deputy PM Supachai Panichpakdi gets commerce.
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