In a recent interview with german GamePro, producer Masachika Kawata explains the reasons why Slant Six was hired to create Resident Evil: Raccoon City:
” There where a few potential candiates for the job with different technologies and expertise. The stoppage of Slant Six however was flexible enough to fullfill our expectations. On top of that, the Slant Six team consists of many huge Resident Evil fans. That has kind of finalized our deal in the end.”
Source: GamePro Issue 05/11 (GamePro.de)