Dominican Gonzalan spirituality 101
Because of Rule of Canny, Gonzalan spirituality looks understandably like the Dominican spirituality it replaces. (At one point, I described Franciscan and Dominican spiritualities as being "Christocentric" vs. "Logocentric"; in Andalusada, the distinction is better incarnational vs. evangelical.) The first and most glaring distinction is that Gonzalo did something Domingo didn't: by adopting (and adapting) the Rule of Saint Stephen from Stephanines, he circumvented a papal ban on establishing new rules."The one rule of our salvation and of all others'," the Rule begins, "is the Gospel of Christ..." - and it goes from there, in a fairly stark fashion. More specifically, the Rule is followed by a distinctly Augustinian, southern, and... well, let's be honest, openly schismatic reading of it, which lead to hundreds of Stephanines defecting to Gonzalo's side when it became known to them. That southern-Augustinian-dissenting addendum moderates the Muretin starkness, but in doing so also emphasizes the features of it that are most recognizably Dominican.
(This means that, from the very start, a case could be made that Saint Gonzalo wasn't following his own Rule. It also means that, unlike the Dominicans IRL, it's both meaningful and possible for there to be Capuchin-style strict-observance orders. Some of those strict-observance sausage parties were probably key figures in the rise of the Sodality.)