See I'm not convinced its lazy writing, I think fate is a pretty big theme in Heroes and so these things are not only a writers way of involving more of the ever growing cast of heroes but also a way of showing that this is *meant* to be. Haven't you been listening to Peter? ;)

Also Isaac spent all his points on his awesome power and his many points in "good looking even while a heroin addict" so he has to get penalised somewhere.