An opes usage question.

I have been looking over the opes drafts and trying to understand the 
efficiency of a distributed opes framework with a large volume of 
activity (and also trying to gauge how useful it would be for time 
dependent service execution activities). Consider an opes service where 
application data is transformed (or adapted) in some way. My question 
is, If I send the data flow to a callout server to perform some opes 
service task (or a string of call out servers), does the data always 
have to return to the data dispatcher at the opes data processor that 
directed the flow to the call out server in the first place (an 
ancillary question is: can just trace data and billing information only 
be sent back)?. Basically, will an opes framework allow the use of a  
piplining approach where once the service is complete at the call out 
server, the adapted application data can be forwarded directly to the 
data producer or data consumer (what ever the case may be)?  Any 
information, advice or council would be greatly appreciated. Thanks.
Regards   John