I haven't played much with SC/thugs and bodyguards. I know bodyguards tend to mill around the guarded commander. If they block his path forward, can he push through them? Move onto and through squares they are already in?
This would only be a problem with large numbers of guards.
Just a quick response, but I'll send over the turn file.
First battle could have been a blocking problem, but the second battle the Deva had actually moved forward for a turn, getting pretty much free of the friendly troops, then turned back and dived into the centre.