It's perhaps a bit early to distribute the relay legs (apart from Kläbo taking leg 4). Both Norway and Russia have easily at least 6 skiers, who can fit well into the relay team on their day. It will be a tough choice for both nations. And will be most likely decided based on the results at the world championships. For example you can't justify leaving out someone, who wins/podiums in skiathlon or 15 km. And we still have to wait and see, what Falun individual races bring. However, it does look like it's curtains for Ustiugov for this season. On this form he can't make it even into Russia's world cup team, let alone WCH team, where the national quota is smaller anyway.
Norway is in the same way spoilt for choice in men's biathlon, where they have 6 skiers, who can regularly compete for top 10 positions. Looks like Christiansen/Bjöntegaard may not get any races in WCH at all, unless one of the top 4 men in the world cup flops completely in sprint and pursuit, which of course can't be ruled out.
In women's competition it looks a bit more straightforward for the relay. TU.Weng, Johaug, Fossesholm, H.Weng for Norway with perhaps leg 1 being open here. Kalla, Karlsson, Andersson, Svahn for Sweden, with again perhaps leg 1 being open. I thought Kalla was completely out of it due to covid, but seems like she is firmly back in contention now.
Leg 1 is very open for the Norwegian woman's relay. T.U. Weng was unimpressive this weekend and there are a few contenders. Anna Svensdsen is good at classic and the distance suits her. The same with Katrine Harsem. Then there is Falla who seem to get in to form for the WCH as usual. I think the team management is still scratching their heads. What ever they end up with it will probably be good enough to beat Sweden.