I believe the bottom two paler birds are immatures probably one of the juveniles I noted here 12 August 2017. This is a very local breeder here with prior confirmed nesting in May and June of 1994 (BB Atlas data). However this site has only been readily accessible to the public since 2014. This is the only member of the genus Salpinctes believed to be basal to the other wrens. Digiscoped with Panasonic DMC-LX5 | Nikon FieldScope 3 | 30X WA | hand-held (no adapter).
Reference:
Kroodsma, D. & Brewer, D. (2017). Rock Wren (Salpinctes obsoletus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/58107 on 13 August 2017).
Lowther, Peter E., Donald E. Kroodsma and Greg H. Farley.(2000).Rock Wren (Salpinctes obsoletus), The Birds of North America (P. G. Rodewald, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/rocwre