Bah..hyperbolic time chamber...
i hate you, FUNi
its the room of spirit and time
anyway
future trunks and "bojack" trunks are the same person. He's just using it to separate two of the looks. Bojack Trunks has long hair and his coat has no sleaves. Future Trunks could be alot of things...the one used in Solid_Rock's sig, or he could also have long hair with armor like vegeta. hey, they could even have Trunks from the first movie with Brolli.
That's an idea....when Trunks goes ssj, have his jacket burn off like it did in that movie.