I was wondering if dark matter could have been created in the same process, or if it would have been the decay of the heaviest quarks + energetic collisions of quarks that could have created it, or a combination of both.

I guess that this is a very model dependent question and depending on the theory, you could have one or the other. For instance, in freeze-in model, there is no dark matter in the early days and it appears progressively. In freeze-out model, it could (should) be connected to inflation somehow.

And in the end, if calculations based on the various inflaton field models could predict which of the freeze-out or freeze-in model would be favored (i.e., determining the relative quantity of Dark Matter created vs. normal matter).

Some could probably, I would say. But this is not easy (as one would try to solve many questions simultaneously).