Re: Marlon Brown There is no way he is 6'5" (at least in that video...maybe 'now') and his vertical is not spectacular as mentioned above, good but not elite...however he is a great football player and like Tirk says has great lateral quickness and cutback ability for a put together kid. Plus he seems pretty strong as he breaks tackles consistently and his stiff arm annihilates people (although his competition is Ridley-esque).
Re: Marlon Brown I love ESPN's evaluations - way more in depth than either Rivals or Scout. As for Brown, his highlight tape may be the best I've ever seen, but that is mostly attributable to the competition.