Many don't see that the word "intelligence" is very broad.
An organizing principle can be an "intelligence."
In fact, many computers do complex organizing, but none of them are living.
"Natural Selection" was an organizing principle that was applied to all of life as we know it. It has failed as an explanatory organizing principle. The world around us is too complex for natural selection to adequately explain.
The "intelligent design" criticism of evolution says that another organizing principle must be found.
The intelligent design hypothesis states that certain features of the universe and life are best explained by intelligent cause rather than an undirected process such as natural selection.
The intelligent cause is not specified as to whether it is a phenomenon or an agent much less a specific phenomenon or agent.
There are two basic types of intelligence as a phenomenon: emergent property (such as from self organizing complexity) and fractal intelligence. And there are various candidate intelligent agents: God, collective consciousness, aliens, Gaia, etc.
The intelligent design hypothesis does not say which is the "intelligent cause" for "certain features". It could even be a mix of phenomenon and agency.
Any intelligent cause which is determined to be the best explanation for certain features will vindicate the hypothesis, for instance:
2. Phenomenon: That molecular machinery chooses to cooperate to the survival of the whole organism.
3. Phenomenon: That collectives of organisms (swarms, etc.) make decisions the component organism cannot, which gives the species a survival advantage.
4. Agent or Phenomenon: That there exists a universal will to live a life principle, fecundity principle, or evolution of one which is the primary inception of information (successful communication) in biological systems.
5. Agent: That the complexity of certain features cannot be explained by natural mechanisms given the age of the universe.
6. Agent: That order cannot rise of chaos in an unguided physical (as compared to mathematical) system.
The organizing principles concerning biological life to which xzins speaks are currently being investigated by mathematicians and physicists who have been invited to the table by the biologists. More specifically, the areas include information (successful communication), autonomy, semiosis, complexity and intelligence. Such subjects are of little interest to biologists (Pattee Bridging the Epistemic Cut) but are crucial to physicists/mathematicians (Rocha, Schneider, Adami, Kauffman, Wolfram, etc.)
It should also be noted that these mathematicians and scientists do not usually claim to be intelligent design theorists. And to me it doesnt matter whether the answers are found because of intelligent design or despite it.