Makes good sense to get a supply of both, especially if like me, you find leveling ordinary, low level pets tedious. I have a shell-load of charms and will allocate accordingly!

What about the Legion purple battle stones that you use to raise a pet to lvl 25? Can we use these on the BfA expansion pets? Should we be cashing in our Legion charms for these as well as the blue stones to make pets rare?

Anyone have any idea what the drop rate is for the Crimson Whelpling? I have 5000 mobs under my belt in the Green Belt so the posted .1% drop rate seems wildly optimistic?