I understand where you are coming from 100% and I will do my best to explain "discrepancy" in what THN has, and what I have.
1. My ranking is updated on a monthly basis. So as opposed to a "one-time" ranking, I chart progress. It's almost more like a "progress report" where you see movement on a monthly basis depending on how the goalie is progressing, how the goalie is evolving, how their opportunity changes depending on the other goalies in their system, what kind of systematic approach the NHL team has that owns the specific goalie in question.
2. My ranking is honestly subjective. It is not "unbiased" because I am one person, and that would be impossible. I don't rely on solely a statistical formula. it's just my two eyes, my thoughts, my opinions, my projections on a month to month basis. I take a lot more into account in terms of situation and elemental goaltending, and I can't imagine what kind of strategy or technique TSN uses to structure their rankings.
3. So with that in mind, I am under the impression that Martin Jones is an extremely valuable long-term prospect to own. Zatkoff is ahead of Jones in the depth chart and has more experience, but I don't see him being a long-term NHL goalie with a lot of starter upside. But I do see that in many different areas of Jones' game. Love a lot of things about him, especially his size/speed combination. Kings goaltenders get amazing development, are part of one of the most structured development systems in the entire NHL, and get opportunities to shine.
4. Lindback deserves to be the #2 goalie because he's being developed by the best goalie coach in the world, Mitch Korn. It's only a matter of time before he gets more opportunity and at his size, with his coaching, with his opportunity to shadow Pekka Rinne on a daily basis, he has tremendous long-term value. His lack of playing time does hurt, but it is compensated by the fact he's being mentored by Korn and he's watching a goalie very similar to him in biomechanics and technique (rinne) on a daily basis. That accounts for a lot in the world of goalie development.
Hellberg is a terrific prospect as well, but he's not anywhere close to where Lindback is in terms of development. Until he comes over to North America, it's not fair for me to rank him anywhere in the Top-30. He's still got a long way to go!
5. These type of elements that you see above with Jones vs. Zatkoff and Lindback vs. Hellberg are scattered all throughout my Top-150 Prospects Rankings. I am very confident in how I adjust rankings on a monthly basis and I like my accuracy over the past few years. One example is Thomas Greiss. A lot of people felt that he should have been ranked a lot lower over the past year since he struggled in Sweden last year. But even though I was fully aware of his struggles, it had very little bearing on his long term value. You have seen his current placement be legitimized in terms of his value right now, essentially cementing his role as San Jose's backup despite the influence of Niittymaki.
6. The main thing to remember is that I evaluate situation to a very complex and in-depth degree. I am not saying that TSN doesn't do this, but I follow and track and stay in tune with all of these prospects every month.
It is a part of Goalie Pattern Recognition, a term I feel very strongly about, and something I know I have in my mind. GPR is also a big part of my new daily starting goalie tool, the Starting Goalie Rating Index. The more goalies you watch and track, the more patterns you discover in terms of prospect development, the more aware you are of situations that are likely to arise.
I am super curious to know who compiles their goalie rankings...I have an idea of who it might be ... but can't really comment since I don't know for sure.
I hope that gives you a better idea of where I'm coming from with my Top-150.