Seems to be much interest or concern over this minor issue.
This is standard work practice when attnys work in teams - all have noticed there appearance as RA counsel on this case. Hennessey entered a limited appearance for the Contempt quick action - so you'd not expect to see him signing docs related to the RA trial case ... only the Contempt quick action. Ausbrook did the same. Weineke also entered a limited appearance.
But Rozzi and Baldwin both entered appearances as court-appointed defenders and RA's counsel on the RA case where RA is charged with the double murder and either of them alone or together can sign their motions. And if Baldwin signs a motion, Rozzi can show up and argue it and vice-versa.
Nothing much to be surmised from a single signature on motions filed from a counsel team except perhaps a team member was out of the office, sick, on vacation, in court on another case, or there's a timing rush on the document.
Hoping this explanation helps. JMHO