Have you seen them, EVEN ONCE???
Otherwise, just kindly shut the fuck up.
I am actually semi-excited by the Nimani rumour, which isnt new because we have been linked with him since he was 16-17. He would be a quite a good squad player to groom in (quite raw, but very good, about to have his breakthrough season now, with this strong start to the season, 3 goals in as many games), last teenage striker we bought from Monaco wasnt too bad

You would probably have said a teenage Trez is crap to go for, simply because you dont know him.
While Subotic has looked promising in the 2-3 games I have seen (was unlucky in the Schalke game with the handball, but scored a good goal), looks like a young upcoming defender with good qualities. One that wont stay long in Dorthmund at all, and will typically go to Bayern, or in one of the top leagues sooner then later.
Both are 19, and starters for good teams in Bundesliga and Ligue 1 (its especially hard to be in the starting eleven at that age when you are a defender), to be skeptic is fine (and I share your ambition for better), but to outright say they are crap without seeing them is RETARDED.