I dont see Quaresma as wasted talent, he was just a flashy creative winger, he didn't showcase this must have high level impact that he was wasting by being a dumbass wasted clown, tho latter describes him a bit, the big talent part doesn't.
He performed close enough to his level, which was an average player with his abundance of limitations and all in show. A flair and fancy dribbler doesn't mean a good player, let alone a top one, he didn't belong in higher level.
Wasted I call Pato, man was near world class from teens to early 20s, looked destined for greatness, then continaution from previous injuries, and from then on nada. A total bum playing in amateur leagues.
More high level for couple years but more tragic fall was Adriano. Fiercest young striker in some time early on, then his father passing, depression (substance abuse) and injuries, the trifecta of pitfalls ending what was one of the best potential careers.