Ameraucanas are so hard to tell, the lighter blue might be cockerel, but then again might not. I'd give that one 50/50. The darker one is definitely a pullet, as is the olive egger. You can tell with the olive egger because of the shafting. That is a mighty nice Wellie boy, and the Wellie hens in the background look pretty nice too.
I like my Welsummers too much to crossbreed them, I'm using Marans hens to create my olive eggers. Well actually one of the hens in with the Aracauna roo is a "dark egg, black sexlilnk" which was from a Welsummer roo over a Cuckoo Marans hen (not my doing). My goal with the olive eggers and easter eggers is to put as much different color genetics into the flocks as possible so a person will be able to get nearly any color or pattern from my chicks. Someday I might put a cull Wellie hen in the olive egger pen but not yet.