i think lee was sincerely crying, thinking of all the times throughout life he'd taken the blame for casey, helped casey, smoothed things over for casey, saved the day for casey.....and on and on and on. i think he honestly did feel hurt and used and ticked off that after everything he'd done as a big brother for casey, he was treated like crap. again.
i think ica had been preparing to cry during lee's testimony, building up to it. i think the expectation was that once again, lee was going to come to ica's rescue and answer jb's question as to whether there were other reasons he was upset with an entirely different answer than the simple "no" they got.
in other words, i think we may have just watched lee stand up for caylee in a manner that not a single other family member has done yet. jb would not have asked if there were other reasons he was upset unless jb expected him to answer in a way that made his client look like a victim. fail.
the talking heads are wrong this time, imo. i don't think this does a single thing for the dt and over lunch, my bet is the jurors will think to themselves: "wow. not only did that cretin murder her beautiful child, she spent all the prior years making a living hell of her brother's life."