I don't think all branches of evolution lead to intelligence given any finite amount of time.

I think the real only limiting factor prevent them from accomplishing what we have is that they do not have the limbs and dexterity available which we have. This enabled us to perform many tasks which are out of the question for them. I'd say they do damn well for what their body's allow them to do.

Of course not, but there just has to be one apart from ours, right? Besides we will all be extinct anyway before that because evolution takes billions of years.

That's probably a question that CS researches will get to address one day in the future... Estimating what percentage of reasonable length DNA arrangements leads to intelligent organisms.

That's not a meaningful question; it needs selection pressures over time to make sense.

Has to be one apart from ours? For what? For there to be two special species?

They've had exactly the same time we had.