Minipost: Sneaky way to get Raiding with Leashes

I did this as an experiment last night with Aza.  Aza gave me the last pet I needed for my Raiding with Leashes (which was an Anubisath Idol), which was one of his own ones.  So I got the achievement!  Thank you Az!

So then Az said "Hey, I wonder if..."
"Hmmm?"
"If you cage all the pets for the Raiding with Leashes and trade them to me, I learn them and then pass them back, would that work?"
"Hmm.  I don't know but it SHOULD work?"

So we tried it.  And it worked.  Now Aza has a Mr Bigglesworth, just like me.