Hello,
There is no problem or performance issue associated with the staggerred state you have explained.
RG0 -RE - Active on one node
RG1+ - PFE - Active on another node
The only difference in the scenario you describe versus all RGs being active on the same node, is that the RE-Active PFE communication will be over the physical control link connecting the two nodes. Since a stable control link is a pre-requisite for a cluster, there are no issues with the cluster being in this state.
Regards,
Vikas