Yes it dont gives the Highest one.... no doubt.. i confirm it...
the highest one gives 4 times the bitrate and size too...
i downloade one episode from biezom script it gives me 216 mb file with 2500 video bitrate and than i did m3u8 edit and download via ffmpeg and gives me 876 mb file with almost 10 mbps video bitrate....
as the flavour id is of highest bitrate one is not listed in mpd or anywhere you can get it again by editing your m3u8 link ....
maybe biezom can do any trick as i dont know about any coding...