reverse proxy – Apache – ProxyPassReverse multiple entries with same host

we have configuration (not configured by me, and dev who configured is gone) like so:

<Proxy balancer://acluster>
BalancerMember ajp:// route=r1
BalancerMember ajp://10.10.10..1:8123 route=r2
ProxyPass / balancer://acluster

#ProxyPassReverse / balancer://acluster
ProxyPassReverse / ajp://
ProxyPassReverse / ajp://

I am trying to find out, what is the purpose or effect of having those multiple ProxyPassReverse entries instead of using that line which was commented out.
Thank you