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Possible yes, but probably is another issue. How probable?
Anyone can see the mucous saliva coating your mouthpiece after taking it out at the end of a dive. So it's no hidden fact that we swap spit when we do an air share from the primary. Likewise it was no hidden fact that spit (and air) was swapped back when they taught mouth to mouth.
The variables between the study and the conditions involved in an air share are highly different, so I wouldn't use that as the sole example of you should or shouldn't swap primaries in a training scenario; in relation to avoiding Hep C. Now if something were transferred through saliva such as a common cold or strep, then that's a definite no.
We are supposed to choose our buddies --as if they are the most important gear choice. This is just another reason not to FAIL on your responsibility to find good buddies...Don't to be so LAZY that you end up on a dive trip with an "insta-buddy" .