You've got a good start, since you counted toes and looked for feathered feet and the color of the feet. I've seen plenty of other people who try to identify chicks based on color, and forget to check the feet at all
You are probably right about the Silkie, but it has a chance of being a "Green Queen Easter Egger," since MPC says they can also have 5 toes and even silkie feathers. You will probably know for sure when it starts laying eggs.
None of your chicks are Barred Rocks (color is wrong).
Polish would have a crest on their heads, and usually have a bulge on the top of their skull-- I'm not seeing that, so you probably do not have any Polish either. (Most of them are also the wrong color for Polish.)
For Easter Egger vs. Welsummer:
--Welsummer must have the chipmunk-striped chick down, while Easter Egger can have that or any other color.
Aldieb must be and Easter Egger, because it is the wrong color for a Welsummer.
--Welsummer must have a single comb, while Easter Eggers can have any comb (but often have pea combs.)
Bella and Aldieb have pea combs, so they must be Easter Eggers because Welsummers cannot have pea combs.
(I'm not sure about the comb type on the other two maybe-Welsummer chicks: it can be hard to tell when they are young.)
--Welsummers cannot have muff/beard on their face, while Easter Eggers (and Silkies) can have it or not. Beard is extra feathers under the beak (like a beard), and muffs are extra feathers on the side of the face.
I think I'm seeing puffy cheeks (muff/beard) on all of your chicks, which would make them one Silkie and four Easter Eggers. It can be hard to tell on little chicks, but is usually obvious after they are a few months old, so this is something you may want to watch for as they grow older.
--Welsummers have yellow legs, so any with not-yellow legs are not Welsummers (I see you have already been checking this.)