My jaw is dropping...how can you listen to 'down on me' or 'sincere' and not hear jungle ghosting away all over them. Ever heard any Tom & Jerry? Or Nookie, or Peshay...
2-step wasn't jungle slowed down to garage tempo, it was something new, an evolution out of jungle and a synthesis of different sources, like US r&b, MAW, MK, blah blah blah. Certain elements and tropes that were maybe less prominient in jungle seemed to find more promience in the garage/2-step structure and culture, and some things were buried just below the surface (like the odder, darkcore influences...but only for so long, then the weird garage of m-dubs and agent x fought its way to the surface again and off we go towards grime and dubstep).
There were definitely people in garage who were not key players in jungle but so what - thats the whole point, it was a different form, but one strongly connected to jungle.
The thing as well with dubstep...if you ask people what influenced them, what they listened to - irrespective of what you think it sounds like now - the tempa/hatcha/kode 9/dark swing branch of dubstep did not emerge out of breaks. I'd be surprised if a lot of dubstep producers had ever heard of half those breaks guys you mention, let alone been influenced by them.