Cute and Confusing Colors

We are still unsure about some of the kits' coat colors.  We know we have one self black and one self chocolate for now.  They could become steels in the future.  We know we have a chocolate chinchilla.  We believe we have a chinchilla and two blue chinchillas.  The last one we just don't know about.  If it was from Snowball's litter, I would say it was an agouti.  But Tootsie and Ninja are both selfs, and thus they cannot have agouti offspring. 

Left to right, darkest to lightest--self black, ?, chinchilla, two blue chinchillas, chocolate, chocolate chinchilla

He was born black, just as black as the other black.  But in less than a week, a tannish golden color started coming in. 

Here are the genotypes of the two parents:  Ninja is aaBbCcDdE_.  Tootsie is aabbCcchlDdEs_.  So what is this little guy?  All guesses and any suggestions would be appreciated.