BOTTOM LINE:
When Bourjos and Trout are on the same team their value is maximized with Trout in LF and Bourjos in CF.
Trout in LF does not maximize his value, therefore THEORETICALLY trading one of Bourjos / Trout for an equivalent valued LFer would maximize the teams value. This is only true if you assume trade markets are completely efficient, THEY ARE NOT. A trade of Bourjos is unlikely to bring us back a equivalently valued player in return.
The question then becomes 'which loss is least significant, the loss of defensive value from Trout playing LF, or the loss of total value of a lesser player replacing Bourjos?'