Is Dr Tony Tan principally responsible for GIC's S$10 billion UBS investment loss (paper) this year?

Is Dr Tony Tan principally responsible for GIC's S$10 billion UBS investment loss (paper) this year?

According to 'Who could fill Tony Tan's shoes at GIC?' [TDY, 23June2011]
- "In 2005, Dr Tan was appointed to the then newly-created post of executive director when he retired from politics."

According to : 'Rogue trader at UBS racks up S$2.48-billion loss' [TDY, 16Sept2011][pict1][pict2]
- "UBS shares plummeted by 8 per cent to 10.07 Swiss francs late yesterday in Zurich, even as the European banking sector surged on news that central banks would provide additional liquidity to prevent the money markets from seizing up.
The share price plunge is bad news for GIC, which holds a 6.4-per-cent stake in the Swiss bank. Based on the last traded price, GIC is sitting on about 7 billion francs, or S$10 billion, in unrealized losses, even after taking into account the 2 billion francs it received on the coupon before its 2008 investment was converted to shares last year."

Since Dr Tan was executive director of GIC since 2005 till the time of his candidacy for recent Presidential Elections [wiki] this year, could it be said that he would be significantly responsible for "GIC.. sitting on about 7 billion francs, or S$10 billion, in unrealized losses" due to "its 2008 investment [in UBS that] was converted to shares last year."
==================

A1forum:
22Sept2011: Is Dr Tony Tan principally responsible for GIC's S$10 billion UBS investment loss (pa
HWZ:
22Sept2011: 2.3Billion Losses in UBS by GIC
SGclub:
22Sept2011: Is Dr Tony Tan principally responsible for GIC's S$10 billion (paper) loss in UBS investment fiasco..
MCF:
22Sept2011: Is Dr Tony Tan principally responsible for GIC's S$10 billion (paper) loss from UBS investment fiasco this month?
SGforum:
22Sept2011: Did Dr T Tan help SG loose $10b this month?
SBY:
22Sept2011: Dr Tony Tan: 'Oops, did I just drop S$10 billion this month?'