[REF] IPN - move unshared chunk of code out of shared function

[REF] IPN - move unshared chunk of code out of shared function

We are passing a lot of variables into recur (& going to a lot of work to construct them) when they are not
actually processed in a common way - returning them to the calling functions makes it clear we are
a skip & a jump from not needing to instantiate objects at all