I haven't followed the line of research enough to judge the merits of 
Rowley's claims, but do want to praise the kind of history of 
economic thought that Rowley is engaged in:  setting the record 
straight on who deserves credit.

The benefits of setting the record straight are both in terms of 
justice and efficiency.  The justice part is clear, the efficiency 
part may be less so.

Many of those who labor to advance economics may be unappreciated in 
their time, and may be tempted to give up.  The knowledge that there 
are intrepid souls (us) dedicated to eventually setting the record 
straight, may buoy their spirits sufficiently to keep them at their task.

Art Diamond