According to GH/F Asia MD Anne Forrest, none of the staff concerned will be moving on to fixed employment.
She said: 'We're at a loss to understand why this has happened.'
Rifts became apparent under the new set-up, according to former GH/F managing director Jeff Schultz, who had changed his title to South-East Asia MD to accommodate Lee's role.
Schultz said Scotchbrook/BSMG was run like a 'local agency', with the BSMG network adopting a 'hands-off' approach.
Five clients are understood to have resigned accounts directly prior to the exodus.