I did review the info on Carlos's website. His fruit is shiny, skinny like a wilson long neck (popinoe). The Russell fruits I showed above is fatter, skin doesn't shine, and is creamy and very good tasting is what I hear. The tree is growing at the person's parents' house, and he has been eating the fruits for a long time and says it is a very good tasting avocado.
Carlos needs to fiind another source, his doesn't look like it to me. But, it could be that this Russell growing in Hawaii (purchased at nursery) may be a seedling tree so that may be the reason these fruits look so much larger/fatter, and does not have that shinny green skin.
Notice that Carlos's avocado fruit is shinny green with no dots, the photos of the fruits above have small dots on the outside of the skin.