Board Thread:Spoilers!/@comment-26443838-20160111023755/@comment-9241531-20160318143458

Hmcooper4 wrote: Here's my thought. Liam will find out that Killian is a prisoner of Hades. Liam's unfinished business is, of course, wanting to protect his younger brother (I feel that was well established in "Good Form"). So, the plan will be for Liam to break in and get his brother out.

Now, Liam will need help from the heroes in order to distract Hades. (even a dead person can't just walk into where Hades is and not suffer consequences). Given the setup we had from Good Form and the Neverland arc, I suspect that Pan may be involved with helping Liam, at least as far as getting hooked up to the heroes. (Pan is on decent terms with Killian, and at least would remember Liam from the earlier encounter).

But however it works out, the end result will be that Liam successfully frees Killian from Hades, and is rewarded with a trip to Olympus/Elysium for his efforts of completing his unfinished business.

^ can't get much more logical than this. thinking you nailed this theory.