Not at all.  The data pointers are modified immediately upon reconnection,
   it would get really complicated if I didn't do that.  Instead, the residual
   [...]  

I said `equivalent to'.  I don't see how the *effect* is any different.
Regardless, you're relying on the amount of data transferred to tell you
something interesting.  It's clear from looking at the SCSI spec that
neither of these is acceptable.