Hummer gorget question

I was able to approach this young male Costa Hummingbird as he was perched on a century plant just off our back porch. What is kind of strange is the color of the gorget feathers. I have never seen one with light brown gorget feathers mixed in with the purple. This may be how the gorget feathers open up and develop before turning the purple color but I not sure so I was wondering if anybody else has seen this or is this part of the molting process going from juvenile to adult.
The larger image shows a side view of the same hummer.
Thanks,
Jim

Of course, the brilliant colors are only revealed when the light strikes the feathers at the proper angle. but these two images seem to show something else at play. The color is not pigment but rather some sort of refraction by the feather structure, so these feathers must not be refracting the light correctly. Are they wet? Just grown? Damaged?

For a better answer than my swag I'd ask Sheri Williamson who wrote the book on hummingbirds - I'm sending you her email separately so you can send these directly to her.

My first thought was that it was juvenal molt to adult plumage, but BNA (paywalled) says that it's from the inside out, not the outside in. There's nothing obviously on the brown feathers, so I'm at a loss. If the contact Richard has given you can explain, I hope you will post it here.

Thanks to Rich we did hear back from Sheri Willamson, her email is below:

"He's a second-year male with retained juvenile feathers adhering to the tips of some of the pinfeathers. The most colorful parts of males tend to be the feathers replaced in a normal molt. Crowns molt back to front, and gorgets molt mainly from the bottom up, with the exception of the "tails" in Calypte. This explains why the dull, worn plumage is where it is. He looks pretty awful right now, but it shouldn't take long for him to finish molting into his full adult glory. Sheri"

Interesting info - thanks for educating us all!
Nice image too - excellent detail on the important head. Hope you can get some shots when he is in his "full adult glory", as Sheri says!
Sandy