Here's my thinking- LE aren't monitoring him 24/7. They don't need to. SG knows he's on their radar and he's not going to do anything while the heat is on him. I'm sure the neighbors, friends, and family are keeping tabs on him as well. Specifically the in-laws. It's been said he's shacking up with them. I think it's a calculated choice by the in-laws. To SG and the public, it looks like they are supporting him. I think it's far more likely they aren't supporting SG, but are supporting and protecting their daughter.
While I agree that denial is a huge possibility with friends, family, and wife, I think any parent in the in-laws shoes would let fear trump denial every time. They may not want to believe their daughter's husband is capable, they may hate to think about how that could potentially reflect on the family, but keeping their daughter safe is their #1 priority. And what better way than to have eyes on her (and him) at all times. All just MOO, of course.
I also think it's quite possible there's been more said by friends, family, coworkers, etc. of SG that we're not aware of. The fact that friends aren't coming out of the woodwork pointing fingers doesn't mean they aren't doing so while speaking to LE, and if LE is worth a darn, they've talked to all of them. Chances are, if SG is responsible, he's done something to set off a hinky meter somewhere. I also think it's quite possible there are friends that are far more involved than maybe they knew originally. I would imagine those might keep their mouth shut for fear of repercussions (legal or otherwise).
I think the lawyer is being a lawyer.