1st lets get the WS out the way. With the kinked White-sided in the original "Pewter" clutch, we've seen it happen before when a FEMALE is carrying a trait she's able to produce a HomoZ offspring with ANY male (or no male at all) through Parthenogenesis.The mare simulation of reproductive behavior is enough to get that process going, Fertilization does not need to occur.
By all accounts your 3x het (PB-WS-Ax) female came from a "peanut butter" to White-sided pairing (collaboration with you an Jeff L.) correct. so you assumed the axanthic was present in a HomoZ form. I remember the 1st "Pewter" and i thought you jumped the gun by saying it was an axanthic-jelly... there was no Axanthic in the jelly to begin with (you can't have a HomoZ without there being a HeteroZ).
If you're breeding the "Pewter" to it's mother and a NE Axanthic and getting SOME axanthics it may be HET axanthic (did you get all Axanthic from "Pewter to NE-Axanthic... if not then it's only HET Axanthic)
If you bred the "Pewter" to a HET for PB female and got all normals it all depends on the size of the clutch, if there was a BIG clutch with not one PB or "Jelly" then your "Pewter" may not carry either PB OR Amel. Is it possible to get all hets/normals in a multi-morph project YES! But the assumption is that the "Pewter" is a HomoZ Axan-Jelly, so breeding a HomoZ to a Het it's near impossible to not get HomoZ offspring in a large clutch.
You bred the "Pewter" back to it's mother and got ONE PB... you breed it to an unrelated female (HET PB) and got zero morphs... that i have no answer for. but it relates to the last paragraph; If there is PB or Amel in your "Pewter" you'd get morphs!
You bred "Jelly" X Ghost so hence your "Jelly", Hypo, Axan hets (so we know they were all het GHOST for sure some were het PB others were het Amel)
If you got "Jellies" in that clutch then your pair was (PB, Hypo, Axan) X (Amel, Hypo, Axanthic)
If you got "PB" that pair is het (PB, Hypo, Axan)
IF you got Amel T- that pair is het (Amel, Hypo, Axan)
NOW you may of had TWO MALES from the original pairing ("Jelly" x Ghost) in that project with ONE FEMALE,one of those males could be het (PB, Hypo, Axan) the other (Amel, Hypo, Axan)... this would be the ONLY way to get PBs, Amels & Jellies in the same clutch (besides breeding Jelly x Jelly)
Lastly you got a Similar LOOKING animal to your "Pewter" but you can't say it's a "Pewter" just yet. Personally i can see subtle differences, for example the degree of speckling: the 2nd snakes was heavily speckled from hatch the 1st one developed it's speckling with age. But they are two diff snakes from two diff. pairings so there will be vast differences in appearance. if it's a female. keep it, raise it, breed it to the Pewter... see what happens.
That 2nd "Pewter" has a greater probability of being an Axanthic-Jelly than the 1st one. BOTH parents carried the axanthic gene.
All you can do with the original "Pewter" is breed it back to it's mother and see what you get, that's the only way to figure out what it is. Until then you can't exactly put THAT (Pewter) label on another animal without a genetic description of what the original animal is in the 1st place.
Side note: we all need to keep good records when we cross breed/line breed, yes there are new morphs but when you cross a new morph into another or one that's been around for ages there is always the possibility of hidden/unknown genes "floating" around. It's next to impossible to map one snakes's complete genome, but keeping excellent records can eliminate some of the confusion when unplanned/unusual things pop up in a clutch.
~ZF