If impersonation was such a serious thing here, then that means even inactive accounts would be much prone to this, but this is not even happening often and even when it does, the DT members can easily notice the impersonating account and tag it.
impersonating an inactive account is just stupid, like why would someone come back active from a new account instead of just using their original one?
and in the case of banned accounts, it's even more stupid. if someone tries to impersonate a banned account, i would imagine they will get nuked for ban evasion soon after.
Can't the signature banned send the merits ?
signatures have nothing to do with merits system, so yes.