Well, either way, EE or Welsummer, its likely to give you interesting colored eggs. EEs lay blue, green, olive, pink, or tan. Welsummers lay dark brown.
Striped chick looks like our Welsummers... but easy to figure out if you know what hatchery it is from (most don't carry Welsummers; only a handful carry sexed). Was it in the "rainbow layers" bin? Sexed or straight run?
I'd say EE too except it looks like no hint of muffs. I know not all EE...