While Patch 2.1 will help to alleviate the issue of not being able to find/target Odin, it doesn't solve the issue of contribution and rewards.

Where in any other FATE a single group could complete it without help of others (or at least be the major contributor), Odin requires the aid of every one who participates, not just one or two groups. Without everyone contributing, no one will succeed.

However, in the current system if you succeed as a server to down Odin, those who achieved Bronze get nothing. As mentioned above, eliminating the people who get Bronze from other FATEs would still result in a success, whereas if all those people who got bronze during Odin were never present, defeating Odin would not be possible.

My suggestion is to adjust how Odin's Mantles are awards such that Bronze receives one Mantle for a successful completion of the FATE and Silver/Gold receive more (perhaps 2 for Silver, 3 for Gold, or even 3 for Silver, 5 for Gold). This would reward everyone for their contribution, given that everyone's contribution was necessary for success.