Is it easy for lets say the bottom and mid hive holders to get a post to trending?

Why should it be easy? Is it easy to get a starting spot for the Lakers or Real Madrid? Could you get a starting spot for your local city team?

The next two on the list have 700 HP and 129 HP

That is the top 15 in Trending. Also, most people don't use Trending, they use communities to find their content these days.

You should have a look a bit deeper.