Its not just this though, there are phasing issues for launching Shuttles
and Soyuz to consider as well.
Brian

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Albert Blauensteiner wrote:
What is the problem to postpone the Soyuz launch a couple of days in
context
of an international partnership as ISS seems to be ?


NASA doesn't want other vehicles to be moving around its shuttle.

While this is perhaps no longer such an issue, in the past, a soyuz
docking at zarya would be awfully close to the shuttle's tail and the
soyuz wouldn't really know it was there.

There is also a question of ECLSS capacity. With a shuttle crew, the
station is already strained for ECLSS capacity, adding 3 more from the
soyuz would make the station very crowded.