My wife's friends might say the same thing about me with my daughter. My wife is a stay at home mom, so her friends always see her with my daughter. They don't see me teaching her to ride her bike (or roller-blading with her while she rides), or taking her to the pool all summer, or going to a field to play catch with a frisbee, or many of the other things I do one on one with my daughter. Add to it that NC and BC were divorcing and that NC apparently liked to exaggerate, and it would be easy to see why her friends didn't think he was very involved. How would they know unless she told them? Why would she tell them something positive about Brad since they were in "hate" mode.
Also, as has been pointed out by others, and by NCs friends...she led a very social life. She went out frequently in the evenings (if I remember the affidavits correctly). Who was watching the girls during these times? Who watched them in the mornings when she was doing her runs? BC was. So I think his "lack of involvement" is a bunch of bull. I doubt he's less involved than most dads where the dad works and the wife is stay at home. Obviously he had other activities like his MBA. But according to what he said (and I believe it), the MBA was something she encouraged. He also spent a lot of time training for ironman competitions. But she was training for a half marathon. I do half-marathon's as well (I did a full but it kicked my a$$, so I'll stick with halfs). I use the time I spend running to decompress from a job VERY similar to what BC does. Not the same company, but from what I heard today, very close to the same job, also in VOIP.
I've been reading this site since the murder happened. Again, I realize he is the person that probably did this. But I find it fascinating how every single thing he says or does is immediately spun into something nefarious here. I sincerely hope he didn't do this because those 2 girls don't need to lose their father as well. If he did, I hope they have real evidence to convict and he rots in jail. But I don't see how anything that has been shown to date comes remotely close to showing he did it beyond a reasonable doubt.