See, what's concerning, is that he called Kelli at 3:00 at that had to be while she was still at work, and apparently specifically asked her if she had plans for the evening, and she said no. Why would he ask that question? Had he already arranged with Kelli that he would be traveling to Florida? So, when did he leave? What time did he leave? Or was he still around town and saw Nick picking her up to take she and possible friends to the bar?
Since LE confirmed MB was in Florida (see my prior post), imo he and KB were chatting, and during the conversation they talked about what they independently planned to do that evening.