Gliscor I don't count on being a Major Tusk Check if he goes to Ice Spinner (but he WILL need it to hit the thing), but Gliscor brings a lot of stuff to the tier defensively between Ground/Flying and the Recovery Nerf far increasing the value of Poison Heal (whether or not he gets Roost back). It's basically the perfect stop to Sneasler and Spore users, for example, and can take advantage of that typing better than Lando thanks to that passive healing and maybe SD for Snowballing off the turns. Gliscor seems like exactly the kind of things Balance teams need, and not having to watch for Spikes is always a plus in this hellscape Meta.
As for Snorlax, I always wonder who refuses to give him Slack Off, considering he'd shoot right up to UU/RUBL minimum if he could get his health back without using Rest. I think a "just generically fat" Pokemon would be a good compliment to Tusk in OU given the latter's Physical lean.