Here’s a rarity which not many will know/remember. In 1987 the french written Belgian weekly Vlan added an article under the heading “La dynastie de Moor dans la B.D.” (English: The dynasty De Moor in the comic world”). The article was accompanied by this drawing.
Interesting about this drawing is that Cori (as well as the head of Bob De Moor) on the left were drawn by Johan De Moor while Gaspard/Kasper (as well as the head of Johan De Moor) were drawn by Bob De Moor. But both signed next to their own characters to make the confusion complete.
Johan would finish the last pages of the final Cori album, Bob De Moor being too ill to continue.