Jules may sound harsh but he always means well--he is always taking in rescues therefore he sees the dark side to everyone's husbandry. Sometime's it's hard to see things like this constantly and not get a little miffed. What he is saying is basically the correct advice. The thing is if you attempt to house two lizards of any species together the best thing to do it follow the dual basking site rule first---then if any problems arise seperate immediately. If they are aggressive even with their own little corner of the world then basically bad things will most likely occur when you are not home or are not observing.
Since you had one site in one cage and expressed you had no choice but to house them together I tried to give you options regarding this setup.
Usually with lizards you have to observe them initially---each day and check for behavioral problems that may point to seperation. Especially with beardies. It seems they either get along very well or they do some pretty serious damage if they don't...and some people don't see the signs until that damage has occurred. Then they might end up with people like jules because they can't be placed

Good luck and keep us posted!