Comment by 3lambda

Cool idea! However I think the Mars to Phobos sample move would be nearly as difficult as MSR. The hard parts of MSR were landing, sample collection, ascent from Mars and rendezvous with the return orbiter. The only thing this would change would be the last part, which would still be a rendezvous, just not necessarily a synchronous rendezvous. It could be useful for solving some transfer window timing problems though. And it would be awesome.