About GotG + Tony: What about GotG taking Bucky with them instead? Apart from Steve there's not much left for Bucky on Earth and the Guardians are practically experts at "Life is determined to screw me over..." and "All alone and completely displaced.". And no one would even bat an eye at his arm out there. Also, he can't get anymore out of his time than he already is. Why not add space travel to it?