Yes, I find it odd that his name hasn't been brought up again - especially as the house was supposedly had needles and other paraphernalia when they moved out of the children's home - It just sounded rather unsavoury. (Young children, drugs, paedo friend.) But could have been completely innocent of course.
No doubt CB supplied the drugs to Roman, but as stated by tedtink, it all sounds sinister, what actually took place there?