If that's that case then Pac-man should be the definitive survival horror game. Which is not. Yes, there were "survival horror" games before RE but the term was coined only when RE came to be. Alone in the Dark was never made to be a survival horror, rather it was created to be an action adventure game. Sweet Home was an RPG with horror themes. Btw I'm not denying Sweet Home's and Alone in the Dark's influences on RE, but if Shinji Mikami hadn't created the "Survival Horror" genre with RE and it's conventions, those games would never have been referred to as Survival Horror games. In fact, the term would very likely not exist and games like Silent Hill, Haunting Ground, Fatal Frame and etc would very likely cease to exist.
I think you give Gears way too much credit. RE4's offset camera and over the shoulder aiming were never seen before in any video game and one of these or both is seen in every single TPS or action adventure game today. As and I said earlier before, third person games before RE4 were either like the earlier Tomb Raiders, GTAs and Metal Gear Solid games. Do you see how much difference these 2 elements make. Imagine Gears, Dead Space, Army of Two with centered cameras and Tomb Raider(2013), Uncharted, LA Noire and etc without the over the shoulder shooting. It's a really huge deal, more specifically the aiming, which is a standard in third person games now. That's why the game was revolutionary.
On the other hand, Gear's cover system comes from earlier games like Winback and Killswitch. The sticky cover system more precisely comes from Killswitch. It's "regenerating" health system is nothing new and has been introduced in many games before Gears was released. (Most recently Halo) It's over the shoulder aim and offset camera is obviously inspired from RE4. While I do give it props for improving Winback's and Killswitch's cover systems, it is in no way original. I will give him credit for popularizing it though.
Everything about Gears is iterative except for maybe the roadie run. There is an article with Cliffy B saying that Iteration was what made Gears of War, citing major influences from RE4 and Killswitch.
Vanquish's slide boost mechanic has been emulated to some extent by Bulletstorm, Spec Ops: The Line, RE6, Crysis 2, Killzone 3, Binary Domain. I'm pretty sure that more games in the future will follow suit.