I don't think this displays how "genuine" he is. On the other hand, it proves that Hrishant is MUCH MUCH MUCH more cunning than people in the house think him to be. He's very observant, very good at people reading, and very good at figuring out a person's true nature without ever even seeing their true colors come out.
I don't think Hrishant is trying to clear Rahul out of his path. In fact, I think Hrishant knows that Aanchal is not the kind of girl that Rahul (and a lot of other guys) would be able to accept as a wife. Her personality is many different shades, and her true nature is one she hides well.
Hrishant is a smart guy, very apt analogy, and very sharp observation skills. Rahul, in comparison, is an idiot.