If its the same lockout, they don't need to be the same reset. Stop spewing garbage.
Ticket it again, and ask for a senior GM if they don't give you a fix.
Edit: Did some google searching on the subject, it appears to be a fairly common bug that can't be replicated in any other instance. In other words, killing 4/6 H MSV, extending, killing Elegon and extending again will not prevent you from pulling Heroic Will even though it has the same restriction Sha has. This is a Terrace specific issue, it would appear. (Further debunking any garbage being spewed about killing it all the same reset.)