Reckon Siddle will play, if nothing more then just so there is some consistency in the bowling attack, while everyone else falls down around him. Will get 'rested' in 3rd or 4th due to sports science.
Still think he is somewhat of green track bully. But I think he showed in recent away tours even when those no assistant he still bowls enough ball in good areas to take important wickets. Last Ashes tour wasn't that bad overall and if they produce green tracks he could be as effect as Harris and Pattinson.