good observation! you guys clarified some things for me. i really don't think that the jail would let some rando dude in to see casey, just to "wish her support." they may just wanted to monitor what this was all about. casey is a moron to begin with - in addition to all of the crazy lies, does she not realize that every move she makes is being taped and analyzed right now? even the hostility she takes with her family paints an entirely different picture of her than cindy and company are trying to portray. it makes her look like a cold unfeeling . she has been, BY FAR, her own biggest enemy.
back to the weird patrick visit. he says to her, "we just wanted to let you know that we are still on your team." why would this be said, if he really was just some guy she knew way back in middle school. she doesn't seem to "know" patrick until mike's name is mentioned. the conversation between patrick and casey takes place on the 24th - she mentions that she wants to talk to mike to her family on the 16th (i think). so we know that she is at least indirectly connected to patrick, as they have mike as a mutual friend, and we know that she has wanted to talk to mike for about a week already.
this could explain why she is nicer to lee and her family after patrick visited her (and seemingly tells them caylee is still alive). instead of freaking out and being evil, worrying that someone (mike?) is going to confess, she can go back to her relaxed spiderweb of lies. i think she assumes that caylee won't be found. and i think at this point, we would be kidding ourselves if we thought she was alive (sadly).
but why didn't mike go and see her himself? unless he wasn't able to, meaning the police already are investigating him, etc. so maybe this conversation was to tell her to be cool, mike isn't going to say anything, we are on your side, stick to the story. i don't read anything into the "relationship" tag from the visitors' log. i am sure they just put that for anyone who knows her. what the hell is going on here? we have a visual of patrick from the video, we need to find him in other pictures somewhere. or mike. he said they went to colonial together - is he on that alumni page at all?