just because someone has an opinion, doesn't make them correct!
Too many folks think they have everything all figured out. 
Head color difference to the other colors has nothing to do with hybrids, it's just an interesting Hondo variation (in my opinion).
Tricolors in my experience are always darker (within the same clutch) when compared to their Tangerine kin. In addition to that, I've observed that the males are lighter hypos than their female sisters.
I can almost tell you what the sex of the snakes are going to be when they all hatch out, again, within a single clutch.
To finally answer your question, tricolors darken up (along with most other "hypos" in a gradual process and it is very case specific (hard to generalize for the entire group; Hondos).
When you get a neonate, it is difficult to know what they will look like as adults. It's always a good thing to get pictures of the parents, but nothing is certain.
Lastly, both of those tricolors I pictured are RIP. Sad story, but I lost many prized Hondos a few years ago and I've been building up my collection very slowly, primarily focusing on the Mega Hypo line.
Hope I could help out...thanks,
Rusty
Here's that picture again...the larger tricolor on the left hand side of the picture is the female.
The second picture is of her as a neonate, about 4 weeks old. You can see when she was young, she was purple!
