I could see if you were a guy who felt like they were "so close" you might not like a guy like Tebow who seems to get these types of opportunities but I think that's sometimes just how life goes.
I don't think you can blame Tebow...he's proven (over many years now) that he's a hard worker too and that he's using his social status to do really positive things for people (which I think plays a role in him still being relevant and desirable in these cases). He clearly works/trains extremely hard too if you know anything about him.
There are many people with your cousin's story....only a handful with Tebow's. regardless of why that is, it's just a rare exception in the world of sports.