i think that 400 extra hours gives you 400 hours more air experience under your butt. 400 more hours to see things go bad, see things go right, etc, etc.
you are right, with regards to sitting in the right seat as a CFI, the extra 400 hours means virtually nothing. i wasnt taking that into account. my point is that when i said 1000 hours, i meant 1000 as PIC...PERIOD.... the CFI time would just be gravy...
Jeff