One point that might be worth stressing, is they cooked the pasta with the sauce, but not a lot of sauce. For instance, I've had a garlicy creamy sauce, and the spaghetti has been covered with a thin coating of it, rather than swimming in sauce which is how we (in UK) commonly have it.
I think the arguement - add sauce to pasta or pasta to sauce is missing the point - you want to mix them both together in a third pan having cooked them seperately beforehand, then allow them to mingle for a few minutes - and not so much sauce! :o