Juvenile Golden-Crowned Kinglet
The Juvenile's do look quite different from the mature examples. This bird was gleening as part of a larger flock. By the time I got my camera on a tripod, the flock had mostly moved on.
I have another photo with a better view of the wing bars.
Frosty Drummonds Cinquefoil
Love it when the species is actually a "species complex". Thistle is another example - many look similar and might be hybrids.