> It is also possible to become out of sync with this if the sender of 
> requests do what is not recommend and aborts transmission
> 16 times. Then the sender and receiver will have there sequence number 
> windows out of sync. I don't think there is a significant issue here. 
> But a warning about this might with the SHOULD NOT abort sentence may 
> provide good motivation.

OK, I would propose adding the following sentence to the end of the Paragraph, 
which I believe is sufficient with the SHOULD NOT statement:

<new sentence>
   Note that there is a high chance that both the WTP and the AC's
   sequence numbers will become out of sync.
</new sentence>