I am no expert. I believe @leo.voter has no longer been upvoting individual users as far as I can tell.

Due to downvoting they have switched it to upvote thread containers.

I may have mispoken about commentrewarder. Not sure exactly how it works, but I think all leothreads have commentrewarder as a beneficiary which distributes rewards to all replies.

I think maybe @leo.voter just upvotes the thread container as well so that comment rewarder gets more HIVE--which it ultimately distributes to threads.

Something like that anyway.