In the September 2008 general election, he retained his seat, as well as the leadership of the Green Confederation, and became whip of the parliamentary Opposition to Prime Minister Edward Natapei's government.

Although Regenvanu admitted having known of the plans for the breakout, and having assisted escapees in finding shelter at the Malvatu Mauri nakamal, it is not clear what role Carcasses allegedly played in these events.

[11][12] In January 2009, Prime Minister Edward Natapei's government stated that it would consider seeking Regenvanu's and Carcasses' suspension from Parliament over the charges.

[14] In his latter capacity, he argued that unemployment in Vanuatu should be addressed by encouraging young people to return to agricultural work in their native rural areas, and produce their own food, rather than move to Port Vila where they would often struggle to find a job.

[21] This lasted for only a month; on 16 June, the Kilman premiership was itself voided on constitutional grounds by the Supreme Court's Chief Justice Vincent Lunabek, and Carcasses lost office once more.

[26] In addition to his focus on the environment (including the creation of a Ministry for Planning and Climate Change[27]), the press noted "his unwavering support for the West Papua cause", and his opposition to Indonesia's participation as an observer in the Melanesian Spearhead Group - a position which contrasted with his predecessor's.

The court found that Carcasses, together with Tony Ngari MP, had offered bribes totalling $452,000 to the other MPs to secure their support in a motion of no-confidence to oust the government of Joe Natuman.

[31] Additional charges of inappropriate giving of loans under the Leadership Code Act were dropped after it was ruled in a separate court judgement that the Ombudsman had not followed proper procedure in preparing a report into these allegations.

[5] He was not among the MPs who faced additional charges of conspiracy to pervert the course of justice after Speaker of Parliament Marcellino Pipite, one of the convicts, attempted to use his powers as Acting President to have himself and the others pardoned.

[35][36] Kalosil ran for a seat in parliament representing Efate Rural Constituency for the Green Confederation in the 2025 Vanuatuan general election, which he lost.