I am not sure which one is worn tbh, both look okay
BTE I fixed it now :) I put the brushbar directly on the cog, no problem.
Then, I got 2 pieces of rubber and put them in the end cap to fill the gap up, now there it a filled gap which is rubber and acts like a spring whenever it needs to to prevent putting strain on the brushbar, end cap or cog. It's brilliant now :) just sometimes makes a slight rattle once in a while