See what you mean now, the wording could be interpretted that way alright but it only counts the cards just recently removed for its effect, not any cards already in the removed from play pile, either from previous Bazoo power-ups or other effect.
In the ARRJ issue 2:
"If more than one "Bazoo the Soul-Eater" is on the field, each must remove their own monsters from the Graveyard to increase their individual ATKs."
So it doesn't count the number of monsters in the removed from play pile, only those which have just been removed for it's effect.