There’s a school of thought that says James Harden is house money. Whatever boost the Sixers would net from him would be more than the boost that Ben Simmons is giving them. As long as they do not subtract anything else from their rotation, what’s the real harm? It’s a fair question, but while we’re asking them, let’s take a few moments to think through some of the ones that would arise if the ongoing discussions between the Sixers and the Nets result in an actual trade. The overarching unknown: How would this team look? 1. Can Harden and Joel Embiid raise each other’s games, or will they need…