The direct deps of gst-plugins-{bad,good,ugly} are clutter, flac, libsoup, aalib, libpulseaudio, libvpx, libdv, taglib, libavc1394, libiec61883, cairo, gdk-pixbuf2, libpng, libjpeg-turbo, speex, gtk3, libdvdnav, soundtouch, libexif, curl, libmad, libsndfile, faac, faad, libmpeg2, bzip2, neon, celt, libass, libdca, libmimic, libmms, libofa, libvdpau, libschroedinger, libgsm, mpg123, libdvdread, libmpeg2, lame, liba52, libcdio, twolame and x264.
I feel it goes against the ideals of tc to load all of these "just in case" they're required.