Same distance different priority fortigate

Hello There, I am wondering if someone could help me understand the following: Scenario 3a : same distance, different priority. Configuration example: config router static edit 1 set device "port16" set gateway 192.168.183.254 set priority 2 next edit 2 set device "port13" set gateway 172.31.225.254 set priority 5 next end The routing table contains the two static routes but only the one with the lowest priority (port 16) is used for routing traffic. The second one is used to accept traffic ingressing port13. Whats's the meaning of "accept traffic ingressing port13" here? Is that means if an outgoing traffic from LAN to WAN goes out using primary route then return traffic will be allowed (if arrives) via backup route which is port13(keeping RPF is working in loose mode?)? Thanks in advance! Cheers Null0