Hi Mider,
I'll start with the Jim Grover clip you started with. It's actually not a bad concept at all (small caveat here, my sound isn't working on my PC right now, so I'm only judging this, and the following, on the actions I can see). In terms of him not removing the knife, he seems to be going for a more "incapacitate them with brutal striking" approach, removing a weapon is more for when they can continue an assault. Personally, I'd prefer to remove it anyway, but not at the expence of a safe escape (in other words, if I have created a brief moment when I can escape, safely, then why would I sacrifice that escape just to stay and remove a weapon that is no longer threatening me?), particularly when such a small (and therefore awkward to remove) weapon is involved.... after all, in the heat of everything, I probably wouldn't even recognise that there was a weapon there. My only real issue is why he called it "Knife Disarms" when there were no disarms at all... hmm.
Now, to your next list. First to the Dennis Hanover group one. Frankly, I'm not really impressed with this one. For something realistic, it is quite lacking in regards to distance (which Jim had), and realistic responce from the knifeman. Add to that some very fine-motor actions, and we have a less-than recommended knife responce set here. He also lacks control of the knife from time to time, leaving him open to actually stabbing/cutting himself. The one at 0:31 is the best of the bunch here.
Dan Inosanto's clip. Hmm. Well, to again be completely frank, this, to me, is a series of movement drills, and if taken as realistic knife defence/response/disarms, then a better idea of reality may be needed. It appears to be essentially FMA-based drills to move a weapon from one side of the body to another, but it is simply not a realistic response against a modern knife assault, again taking no real response on the knifemans part into account, as well as being highly stylised (and therefore removed from what would actually be encountered) attacks, with little body movement. For a movement drill, great. For knife defence, well, that's not what it is designed for.
Paul's clip, well, it's not really knife defence at all. It's knife fighting. So I'm not sure what disarms you liked there. I saw a lot of things that I would recommend against, and some that is downright dangerous, to say the least. Not impressed with this one, to be honest. Again, it's FMA-based actions, which look very impressive, and are fast, so it's easy to get drawn into them, but the actual point, I feel, is typically missed if people think that that is good. What is good in the FMA blade responses is the flow, and the control of the weapon/weapon hand, and these drills are just a way to get that skill. However these are not really good knife defences/disarms, frankly.
As for the Dog Brothers one, did you actually watch the clip before you posted it? It's an intro to a tape of theirs, and shows very little knife defence/disarming at all, in fact, when they do, it's typically pixelated out. That said, the Dog Brothers here have a very realistic understanding of what knife violence is actually about, so they're my top choice out of the presented ones so far.
Vadim Starov's approach is very Systema, it must be said (a bit different from the FMA approach of most here!). I'd have a few issues with the lack of control or realistic response from the knifeman again... Judo Gene may like them, but I'd want to take it through a bit of pressure testing before I put my life behind those actions, honestly.
A favourite of mine would be (again an FMA-based one) Michael Janich. Michael, along with his LEO training partner, started investigating Fairbairns "Timetable of Death", to ensure that the vaunted knowledge was accurate, and found that it wasn't. That began his search for a highly realistic approach to knife combat, and includes response against blades as well. He might look like an accountant, but when it comes to blades, he is definately someone to listen to, in my opinion.