No, because Dyne has already made the route for Harold. And also, think about it this way. You only interact with Harold either during his route, or during anytime involving tennis. Spencer, on the other hand, Spencer is in every route more than he should be. and during each route the hint is dropped that Spencer is gay and likes you. If we were to go off how involved the character is with the MC, to me, it is clear that Spencer is the cannon story and Harold is the default story.