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I seem to remember a question similar to this in Model Railroader (I think!). Anyway, the questioner had asked about running a pair of locomotives in a lash-up, even though one was admittedly less powerful than the other. If you put the less powerful locomotive in the second position, it will assist the other locomotive even though it isn't as powerful. Any tractive force that eases the load on the lead engine's drawbar is beneficial. Granted, the second locomotive isn't doing as much work as the lead, but it is assisting by adding its power to the draw.
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