It's not a difference in skill. It's a completely different game. You can't assume one requires more skill because you yourself have just proven that each is completely different.
Let's say I play a game of regular chess. I am fairly good at regular chess. Cool.
Now, there is another type of game called baroque chess. All of the rules are pretty similar. However, the pieces move and capture differently. Suddenly, I am terrible at the game. Why? How? Shouldn't I be just as good, as it's just a chess game? No. It's a totally different game. Sure, it seems like it might be the same, but it's not. What this doesn't prove is that baroque chess requires more skill.
As an example, my friend, who is a fairly good DotA player, played LoL with me. He was terrible. Clearly, this proves that LoL is more skill-based... Of course it doesn't. It proves this isn't the same game. There are similar elements, similar tactics, and similar rules, but not the same.
So, stop being high and mighty about it. It's really annoying. LoL doesn't require less skill. DotA doesn't require less skill. HoN doesn't require less skill. These games are all different games. Got it? Cool.