who controls redundancy? ae on EX4550 to reth SRX1400

hi there,

Sorry if this has been answered somewhere, but I've searched high and low without a clear cut answer.

We have a setup of two AE links (both with a single 10g member, configured as trunks) originaiting from a VC master and backup respectively, to an SRX cluster reth which will do vlan tagging:

LACPactive                                                  LACPpassive

EXmaster0xe-0/0/1)ae0<--------------->SRX:node0:reth1(xe-0/0/1)

EXbackup1xe-1/0/1)ae1<-------------->SRX:node1:reth1(xe-4/0/1)

It's my understanding that AE will load balance across links, essentially behaving in an active/active state, where as reth traffic is more active/passive behaviour. 

I'm wondering which takes precedence when there is:

A.is no redundancy group interface monitoring on the srx configured:

>show configuration interfaces reth1

vlan-tagging;
redundant-ether-options {
    redundancy-group 1;
    lacp {
        passive;
        periodic slow;
    }
}

B. is redundancy group interface monitoring configured such as below:

redundancy-group 1 {
    node 0 priority 100;
    node 1 priority 1;
    preempt;
    gratuitous-arp-count 4;
    interface-monitor {
        xe-0/0/1 weight 255;
        xe-4/0/1 weight 255;

    }

}

any insight into the above will be much appreciated

cheers!