To be quite honest, I see several things about these that make me highly suspicious as to their actually being genuine sinaloae. And I'm not talking about nelsoni being in the mix in this case either.
The fact that Nathan had some very aberrant "clown" sinaloans really doesn't necessarily mean that these are anything close to being the same thing as his at all, just that they are called "clown" phase by someone, which is not unheard of in this hobby to give something different an already familiar off-beat name to help it out with public acceptance a bit.
The extremely wide temporal band on this thing, and the way the white inner triad rings flair out at the base are just a couple characteristics that are highly questionable to me here. The huge light snout seems a bit out of place too, but there are some genuine lines of sinaloae that do indeed have fairly similar characteristics, namely animals from Cosala, Mexico are well-known for this. So that alone doesn't necessarily mean the weird snout absolutely cannot be a very exaggerated trait of sinaloae. Don't misunderstand this though, yours is DEFINITELY in no way a Cosala Sinaloan either to say the very least, as they are some of the most perfect, text-book examples of real-deal sinaloae there are with extremely wide red body rings, and very low ring counts due to this this. But when all this is considered and put together, it just doesn't look right to me.
The other familiar lines of splotched, striped, and crazy-patterned aberrant "clown" type sinaloans are extremely whacked out, but this one simply looks like a cross of some kind to be honest. Not trying to sound nasty here or anything, but the animal just looks much more like a cross to me, rather than an aberrant genuine Sinaloan is all.
regards, ~Doug
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"a snake in the grass is a GOOD thing" 
my website -serpentinespecialties.webs.com