By Tom Pettifor & Nick Sommerlad & Hollie Bone Olivia Pratt-Korbel ‘s mum has said ‘no amount of time’ behind bars would be long enough for the gang kingpin boss of her daughter’s murderer. Vincent Coggins, 58, led the feared Huyton Firm which employed hitman Thomas Cashman who killed Olivia, nine. The brutal gang leader evaded the authorities for 30 years before he was captured in 2020 and jailed earlier this week for 28 years. But Olivia’s mum Cheryl, 48, said his sentence would never be long enough and believes her daughter would still be here without his drug gang. She told the Mirror : “N…