I caught up with a lad I went to uni with a few days ago, a Wolves supporter for many years, and I asked him why Sagbo hadn't featured more. Wolves only play with one striker and that striker is Bakary Sako. Sagbo was only brought in as cover while another striker (possibly Sako himself, but I think he said it was Nouha Dicko) was recovering from injury. He said they're quite impressed with him, but they were never going to drop their top scorer for some loanee, which is fair enough. He also mentioned the drifting wide problem, which suggests it's more him not listening to instructions rather than a sheer lack of footballing ability.
So it's not a case of him not being good enough for the Championship (which is bollocks anyway) as far as I can tell, it's obviously his opinion but he uses a few of their forums so I'm guessing his opinion is based on what others have said. As OLM said, I'd rather have him here as our striking options are few and far between. His hold up play might actually suit Abel's style if he's so reliant on having a second striker on the field.