1. I miss understood "no include-credentials" function
after doing simple testing. it actually hide manager and operator account in running-config. also all new user password i.e
WITH "include-credentials"
aaa authentication local-user "admin2" group "ADMINS" password sha1
"21bd12dc183f740ee76f27b78eb39c8ad972a757"
WITH "no include-credentials"
aaa authentication local-user "admin2" group "ADMINS"
2. so confirm console always take 1 session even though no console cable or usb console cable connected