Last time we did this was with the integration of Air Hong Kong guys. In that case I think the number of Captains who actually kept the left seat was really really low. There are still a few ex Air Hong Kong Captains who have not made the transition back to the left seat.
If we are talking about the mid 2002 integration, there was only one person who was moved from left to right seat. Others requested to move from left to right to operate the pax fleet as Hong Kong based F/O's due to rostering / lifestyle / salary issues.