Charlie Hebdo is extending its print run to five million copies for the "survivor's issue" from the normal number of around 60,000. The first print run sold out in hours in France while people queued in long lines to wait their turn to buy copies.
Delfeil adds: "I believe that we are fools who took an unnecessary risk. That's it. We think we are invulnerable. For years, decades even, it was a provocation and then one day the provocation turns against us.
"He shouldn't have done it, but Charb did it again a year later, in September 2012."
An issue a year after the firebomb attacks showed the Prophet in a wheelchair saying "You must not mock". Another cartoon inside the magazine depicted him without clothes.
Brothers Cherif and Said Kouachi, and another man Amedy Coulibaly, were shot dead at the end of a three-day siege after they murdered a total of 17 people in Paris and they were reportedly heard shouting "we have avenged Prophet Mohamed!" A video purportedly from al-Qaeda in Yemen said it planned the attack.
However, the claims made by the magazine's founder angered Charlie Hebdo lawyer Richard Malka, who has worked for the publication for the past 22 years.
He told Mathieu Pigasse, one of the owners of Nouvel Obs and Le Monde: "Charb has not yet even been buried and Obs finds nothing better to do that to publish a polemical and venomous piece on him.
"The other day, the editor of Nouvel Obs, Matthieu Croissandeau, couldn't shed enough tears to say he would continue the fight. I didn't know he meant it this way. I refuse to allow myself to be invaded by bad thoughts, but my disappointment is immense."
Croissandeau, said: "We received this text and after a debate I decided to publish it in an edition on freedom of expression, it would have seemed to me worrisome to have censored his voice, even if it is discordant. Particularly as this is the voice of one of the pioneers of the gang."
- The Independent