I don't find helia that strong.

idk

I find Helia much stronger than Sky. Like when he hold the monster when it was about to attack Flora, he only did it with a hand when the others struggling a little bit. I just think they haven't gave Helia a little bit of attention so we can see more of him :) That's my opinion

Helia is very strong in my opinion.

Flashback
Season 2 episode 25 when Sky's ship was messed up and he couldn't get it in because it was unsteady. Helia reeled him in with his rope glove thingy Not TIED DOWN whatsoever.
And in Season 2 episode 8 when Flora was about to be attacked by that monster but he stopped it WITHOUT BEING TIED DOWN to anything plus, he did it with one hand.

Enough said, I vote Helia.

Because of the reasons said above.

Helia is truly amazing. My vote goes to Helia!

Sky even said it himself (well expressed it).

Sky was impressed by Helia.