If he was like Scott he would have killed Leanna. Scott made it clear to anyone who would listen that he never wanted kids. No one saw Ross as anything other than a loving father. I believe the plan for 9th Hour Development was for each member to make an extra 20K per year, to start. So you are suggesting that Ross couldn't wait and decided to commit murder to get a jump start on that 20K from life insurance? You are right, we all have different tastes but I still see zero motive.
As for Ross' education and experience, I am trying to look at this from the persepective of a Warden and his staff. Prison programs are geared toward teaching habitual offenders how to sign their names and hold jobs as dish washers. No matter what you may think of Ross, he has more in common with the staff than any inmate he will ever meet. Since he is never leaving, wouldn't it behoove the prison staff to make him as productive as possible? I'm sure eventually he will be teaching computer classes - perhaps that's why they assigned him where they did.