Possible juvenile Black-chinned Hummingbird

Warning-the following is a very esoteric discussion of hummingbird feathers.
I believe the Black-chinned Hummingbird in these pics may be a male in juvenal plumage. When the top pic is double-clicked to enlarge it, the feathers on the head show buffy edges. Though not as clear, so do the nape feathers and some of the back feathers. Birds of North America (BNA) online states that this is characteristic of both male and female birds in juvenal plumage.
BNA (as well as other references) indicate that the outer 3 tail feathers (r3,r4 & r5) of female Black-chinned Hummingbirds are "broadly tipped with white." However this hummingbird appears to show diminishing white from the most outer to the next 2 tail feathers at least on one side (difficult to discern if true on both sides as tail feathers overlap in pic). A website entitled "Idaho Hummingbirds" shows photos of Black-chinned Hummingbirds being banded, stating that those with "greatly reduced white on r3" (this is the third rectrice,or tail feather, as counted from the center to the outer tail feathers)is typical for immature males. This is basically confired by BNA which states that there is more white in the tip of the third rectrice in females than in male birds in juvenal plumage.

To call this a male is likely a stretch but I think the pics show that this hummingbird is in juvenal plumage (not sure what age). I am hoping that someone with more expertise in hummingbird identification will confirm or disconfirm if this bird is an immature male Black-chinned. SeEtta

Black-chinned Hummingbirds

Before I saw the nighthawk in my previous post, I spent some time in a friend's backyard in La Junta enjoying the Black-chinned Hummingbirds coming to his feeder (and the 30 Chimney Swifts flying over plus the up to 12 Mississippi Kites doing their graceful acrobatics).
This bright male Black-chinned Hummingbird appeared to be the top hummingbird in a few conflicts at the feeder. Black-chinned Hummingbirds are not common on the eastern plains although they have been documented nesting south of La Junta where there is a lot of pinyon-juniper habitat, their most common nesting location per surveys in the 1990's that are documented in the Colorado Breeding Bird Atlas
The velvet black of the male's chin, upper and side portions of it's throat provides nice contrast to metallic violet-purple on the lower part of it's throat. SeEtta