DS has never pooped according to the "textbook" patterns described. DS1 never did either...not when he was exclusively BF'd, and not after I started supplementing. I just breed lazy poopers I think.
Instead of the multiple poos in a day, Arlo does one humongous, leaking-out-of-the-dipe poo every three days. At first I was nervous about this, but it appears to just be normal for him. He's wetting plenty of dipes and growing well, so I think everything is going great.