Miracuclass Chloe decides to side herself with Hawk Moth as an act of spite towards the class and because he promised her a Miraculous… except that it was all a trick in order to try to steal the Butterfly Miraculous and prove herself that she was a true hero and worth of the Bee miraculous.
Unfortunately this gets her chewed out by the rest of the class and she is still forbidden from using the Miraculous… but they begrudgingly admit that her plan saved Dusuu and she managed to outsmart Hawk Moth so they allow her to interact with Pollen again, albeit only if she promises that she will not do anything like that again.
A good theory, and one that is plausible, however the stipulation is that she will not do anything like that again... Alone.
If she has someone backing her up, the danger is much less. Thought Hawk Moth will be less likely to fall for it a second time, having an established member or two that are on the fringes wouldn't be bad.
With all the various interests in the group, it's not that big of a surprise that both Marinette, Juleka, and Rose know about repairing jewelry, and are studying the broken Miraculous. No one is allowed to wear it, but Dusuu is able to be out and with the others.
Oh, he mentions that he knows Adrien, and that his mother had worn him to create him. Oh, and Gabriel is Hawk Moth, is that helpful?