He doesn't neglect defensive work for us. He does his job and keeps it simple when in possession. Maybe for Arsenal he was a bit reckless in that way. Also, please give credit, he is much better than an "attacking Mikel".
I'm not saying he is better than Yaya, why are you arguing that point?
the reason why it doesn't show that he neglect his defensive work is because he played against weak team mostly with us that rarely attack.mikel was a cm too before he was converted to dm and mikel can do everything song can do in the attacking sense but he doesn't really go forward like song so that part of his game really show for chelsea but when he plays for nigeria it shows.