This narrows the total-LBR-received counter down to just the replies that arrived with sequence numbers in the expected order, matching the sequence in which this device's LBMs were transmitted. Since loopback tests typically fire several LBMs in a burst to sample path quality, all replies coming back in order is a sign the path has consistent, low-jitter forwarding for that traffic, while out-of-order replies instead suggest load-balancing across multiple paths or congestion-induced reordering. A loopback test that returns 10 replies with this counter incrementing by all 10 is the clean outcome an admin wants before ruling a link healthy.