The 68-year-old chairman of San Miguel Corp., seller of nine of 10 beers in the Philippines, kept a stony silence throughout a recent battle over the impeachment of the top judge that brought the country to the edge of a constitutional crisis.
But the fact that his own political machine launched the attempt to impeach Chief Justice Hilario Davide has left few Filipinos in doubt that he was pulling the strings.
The impeachment was stopped in its tracks last week when a majority of lawmakers agreed with a Supreme Court decision that it was unlawful.
The question now is how will Cojuangco react?
The answer could have a major bearing on next Mays election when Filipinos go to the polls to choose a president for the first time in six years.
Analysts say that Cojuangco seems to be backing away from making a personal bid for the presidency. The only time he tried in 1992, he was thrashed by Fidel Ramos.
But he undoubtedly has the financial muscle and political connections to be a kingmaker, and the bitter impeachment row may have driven him further away from President Arroyo.
"Many who know him would agree that he is like Don Corleone himself in Mario Puzos The Godfather in that Cojuangco runs a tight ship, works quietly, moves with very little visibility but packs a lot of power," said William Esposo, a leader of a political action group critical of Mrs. Arroyo.
His supporters say Cojuangcos no-nonsense business skills are just what the Philippines needs after years of economic mismanagement that have seen the country overtaken by its more dynamic neighbors and left millions mired in poverty.
They see him as a strong businessman coming to the rescue of a troubled nation a Philippine version of Thai Prime Minister Thaksin Shinawatra or Italys Silvio Berlusconi.
Shifting alliances
Cojuangcos Nationalist Peoples Coalition (NPC) has been in a very loose alliance with Mrs. Arroyos ruling party for three years, often acting in opposition. The failure to have Davide impeached could prompt "The Boss," as friends and employees call him, to back another political horse.
Analysts believe Cojuangco is determined to oust Davide, during whose tenure the Supreme Court has issued several unfavorable rulings on a multibillion-peso coconut levy fund that was used to buy a bank and shares in San Miguel.
Soon after Marcos was overthrown, the new government sequestered a 47 percent block of shares in San Miguel on suspicion it had been amassed using funds illegally collected from coconut farmers during his dictatorial rule.
Of this stake, Cojuangco has claimed about 20 percent as his own investment. The other 27 percent is claimed by coconut farmers and a private coconut producers group.
Since the legal battle for control of the coconut levy fund began in 1987, Cojuangco has won victories at the anti-graft court only to suffer bitter reversals at the Supreme Court.
In December 2001, the Supreme Court issued a landmark ruling that the coconut levy fund was public, or, in other words, belonged to the Philippine people. It ordered the anti-graft court to finally settle the case.
Cojuangco backed the successful 1998 presidential campaign of Joseph Estrada. In 2001 the former movie star nicknamed Erap was ousted in a Catholic Church-backed uprising after allegations that he had plundered state funds and Mrs. Arroyo, his vice-president, took over.
Whom to back?
Cojuangco has deftly mixed business with politics since his younger years in Tarlac, where he grew up on his fathers sugarcane farm.
Many believe it is Cojuangcos business interests that will force him again to wade into the countrys murky political waters, most likely on the side of the opposition.
"Cojuangco definitely will not be in the running but hell support the oppositions common candidate," Esposo told Reuters.
To defeat Mrs. Arroyo, the fragmented opposition is trying to unite around a charismatic candidate, either movie icon Fernando Poe Jr. or broadcaster-turned-Sen. Noli de Castro.
A combination of celebrity and Cojuangcos deep pockets could prove an irresistible election force in a country where fame tends to trump policies and manifestos at election time.
Latest opinion polls show De Castro leading, with Mrs. Arroyo running fourth behind former education secretary Raul Roco and Poe, who are in second and third place respectively.
Cojuangco is dead last at sixth, trailing Sen. Panfilo Lacson, a former national police chief.
Political analyst Antonio Gatmaitan said Cojuangco would stay out of the fray, neither taking part in the election nor openly endorsing a candidate.
"Youre a businessman and youre not running for office, you will probably play the field," he told Reuters. "Thats how hell probably play it."
Gatmaitan said it was now too late for Cojuangco to decide to run.
Earl Parreño, author of an unauthorized biography of Cojuangco, disagreed.
"He no longer trusts a proxy," he told Reuters. "Thats the bitter lesson he learned from Estrada."