Is that what you mean by " A new level of back development thats never been seen before " lol 
no one understands what you mean by "new development" because you have not defined it as you are using it in context.
Ronnie had a BETTER back. Everyone but you can see that.
that is totally different than showing "new development"
as I said: the LAST person to Show "new development" on ANY muscle was Rich Gaspari, who showed up with the first striated glutes onstage.
that could probably be considered a new development in terms of onstage competition because no one showed up with that level of development before.
You are confusing the terms "BETTER" (as in the case of Ronnie's back over dorian's) and "new development" which neither Ronnie nor Yates had over anyone that came before them.