I have to believe FFC considered it. My guess is that there was no easy way to insert this. If it was included in the baptismal sequence, it may have disrupted or diluted the scene. I think the brilliance of the scene lies in its economy. The scene flows smoothly and orderly with dense content. Adding more killings could have had the effect of minimizing the assassinations of Moe and the heads of the Five Families.

Perhaps a single shot of Fabrizzio's sprawled bloodied corpse near the end of the scene could have satisfied those of us, who want him to pay for his transgressions.