Information appreciated on subject.
Originally, the House of Orléans had no interest in marrying Philippe Egalité to Adélaïde of Bourbon-Penthièvre - other matches, namely, an infanta of Portugal, a Polish princess (sister to the Dauphine), and a Savoyard princess were considered.
However, the death of the prince de Lamballe without surviving issue, meant that Adélaïde was thus La Grande Mademoiselle 2.0 - the wealthiest heiress in France. Louis XV cautioned Penthièvre about marrying her to Orléans saying: "your daughter will not be happy, cousin."
Now, my question is, had Adélaïde remained unwed, (Orléans takes a Polish/Portuguese/Savoyard wife instead, the Comte de la Marche (Conti's son) is already wed, with no children, and Condé is already married to Bathilde d'Orléans (Egalité's sister)) who would've stood as her closest heir (male or general)?