I don't see any issue with this.
And i don't agree with any "see, another KHL failure" hot takes. I actually think the Devils are doing this because they like Gusev, and think that if they can just fix a couple of things he'll be a really good player. Otherwise they'd just scratch his ass without saying a word and look for a way out.
We all know Gusev isn't good without the puck, however there are things with timing that are fixable. I was watching the KHL for a few weeks before the NHL season and it just reminded me how different the game is over there. Gusev seems to sometimes try rushing things because he thinks he doesn't have time, or take too long when he doesn't see the pressure coming.
Obviously playing for the Devils right now sort of magnifies his shortcomings as the whole team have struggled. If he was playing for a structured team that just needed some offense it would be easier to look the other way. It was pretty easy for a guy like Panarin to come in to a Hawks team that only needed someone to play with Kane and the rest would take care of itself.
When you combine the preseason and regular season we've already seen what he's capable of offensively. All his goals have/should've been important ones. Freed the team from pressure in the 1st game scoring the opening goal which led to 3 unanswered, goal against Edmonton put them up 2-1 in a game that they probably should've won and he scored practially the gamer winner in their first win of the season in the 3rd when it looked like the Rangers had all the momentum to tie the game up. And in the preseason especially we saw some of the elite passes he's able to dish out.
It's completely different to Shipachyov who looked invisible/totally out of his element most of the time in all the games he played.
In other words, from what i've seen, i think he's an NHL player. Just needs to figure some stuff out.