I think some where loki will join, as oda foreshadowed Sanji to be fourth placer in previous episode may be Loki can be shrinked to fit to Sunny or the sunny can be enlarged to for loki.
No the Hito Hito No mi could be of useful to non human catogry. Let's say the mink they are powerful but yet let them transform into human, like zunesha the elephant or the giant robotos will be epic in my opinion just like chopper.
