Grime pre-dates Dubstep. Dubstep is an off-shoot of grime in many ways.
not really
both are an offshoot of UK Garage
both Grime & Dubstep acknowledged each other, Dubstep more so, but they two different genres which (at the time) drew very different demographics. Grime was street music. Dubstep was for 'intelligent' (
) dance music fans
saying that though, it was the Dubstep demographic who welcomed Grime with open arms second time round (when Grime started to gain momentum again around 2011 through the instrumental movement)
also, just to clarify - Grime hasn't technically 'blown' in the UK, but that cos its black music essentially, and black music doesn't get a look in here. in terms of it blowing on an underground level, that shyt has happened over and over again whether it was Jungle, UK Garage (in it's many evolving forms), Grime, Dubstep, UK Funky, Road Rap, Instrumental Grime etc etc
to address the OP - Grime is not simply UK rappers rapping, it's its own fukkin thing with its own set of rules. the beats are what makes it what it is
Section Boys, 67 and them are not Grime, although quite obviously influenced