Are you sure? I hatched a Pichu and I'm like 90% sure it came from a 5 when Pikachu comes from 2 eggs.
So are they removing Pikachu, jigglypuff and the other guys from hatching. The best thing they ever did was remove eevee and tangela from the 10 egg.
I never caught a zubat Ditto though I did catch a small Pidgey that was a wonder Ditto.