How the heck do you get a wetsuit (I assume a shorty in the pool) off and (someone else's) on while buddy breathing? How would you do it on land?! As far as the semantics of buddy breathing vs. 2 sharing a single 2nd stage-- sounds like something politicians would dream up to keep busy in the legislature. Why would some instructors argue that it could mean someone breathing off your octo? Everyone knows exactly what it means.
Your exposure suit is the only thing you don't swap.
EDIT: I just read the context above. Sorry I missed it. I agree ... how can you make exchanging wetsuits a part of it? That of course requires the team to be wearing the same sized suit, which is not always the case. I have never seen an instructor require that the wetsuit also be exchanged. Seems like a lidicrous requirement to me.