I don't agree at all. With Lebron defense and Noel and Imbid protecting the hoop they could be a pretty good defensive teamI doubt it. Cleveland was atleast solid defensive team with LeBron. They could stop average offensive teams very efficiently.
I can say pretty confidently that the 6ers would not be a good defensive team if LeBron joined them.
Also the workload to carry a team that shitty is a lot harder than you think. Don't think LeBron is quite up for that today.