I think you more than play at it.
As to your question, I think he's a slice below Reinbacher based on watching Reinbacher's NL games as of today. But since neither is a finished product, I can see how people would be keen on Simashev's ability to fuse mobility with play-killing stick work to extrapolate him out to more than what he has produced thus far. Is that the best defensive player in this draft? Not my claim but if everything goes perfectly for him, I could see him hitting those heights. Or I could see him being a quieter, mid-pairing defender who is relatively obscure but still valuable in his own right.
I know that I tend to thin slice guys and then have to quantify what it is that I like about a player later so for me it's his attention to his own zone and how he kills plays with stick positioning, closing to leverage players off the puck and then either taking a step to space with the puck or going to a nearby open partner for pressure release and thus the ability to clear the zone. I usually really like his stick gap and how he can get stick on puck quickly to disrupt what the rushing forward is trying to accomplish. He has the hallmarks of a solid defensive player, the sort of guy who you won't notice if you're just casually watching because things don't happen when he's out there - bad things don't happen (chances/goals) and sometimes good things don't happen (he's not directly attacking the play with high speak handles or rush attacks).
Offensively, I think there is a lot there to refine. I can see that he can see the play developing and he's often making the right decision on where to put himself or the puck. He's not super flashy nor did I see him being super aggressive - that was Gulyayev who never met a rush chance or line sprint he didn't want to attack - but effective? Sure.
Part of it is certainly the package - he moves very smoothly but at his size, that's hard to ignore - and why I started watching him and Daniil But was due to being a fan of a team with way too little size in their prospect pool. I expected to not be impressed, yet I was with both. I'd have no issue with him at 13OA if most of the draft boards break in the first dozen as guys like McKenzie have thus far indicated.
First of all, thanks for the long post
I am on a road at the moment, will try to keep it short
I saw Simashev play this year. There were good and bad things about him for me. In general, good, skater, big, lanky awkward kid who is still adjusting to his big body. Surprisingly lost battles too often, bad shot. A project, a bit like Mattias Ekholm or Anton Blomqvist. If you dont know who is Blomqvist, he was a highly hyped swedish prospect back in 2008.
Now, let me tell you how things in russian hockey work. MHL teams are directly connected to KHL ones, when a player is really good he is usually in KHL and not in MHL. Now, you mentioned Gulyaev, with a player like him, coaches would take a more conservative approach with him since even though he is obviously too good for MHL, he is not good enough defensively for KHL. However with Simashev the claim is that he is "best defensive player in the draft" and he can't make KHL on a consistent basis? Reinbacher made NL for example, and swiss coaches are quite conservative aswell.
Problem is, that due to military political situation right now, russian players are mystery boxes since they don't play any international competition at all. There are special talents like Michkov, who plays in KHL already, but with Simashev/Gulyaev/But etc you just lack evaluation tools since MHL is just, well bad.
You like the player? You think he can become great defensive player because of his tools, well, maybe you are right, like I was when I was high on Mattias Ekholm back in 2008, or maybe like with Blomqvist