It is wrong to think that because if Mario Kart & Zelda weren't out than Switch would have sold significantly less than it has so Mario Odyssey would have been affected as well.

Big games in different genres help diversify a library and push hardware sales, these games do not compete with each other, they complement each other.

you make some good points, but i'm just looking at thing based off some of history of the wii, like mario galaxy 2, and zelda skyward has significantly less sales then there predecessors despite then having 5-7x bigger user base. if a mario odyssia and zelda sequels come out, they won't touch there predecessors.

Shadow of the Tomb Raider bomba, poor her.

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I honestly don’t get this logic. Spider-Man hasn’t gotten in the way of God of War’s sales and I don’t think either will be affected much by RDR2. And a good amount of people here believe the former two games will sell 10+ million. Yet, Nintendo games get in each other’s way...???? 

Smash bros. Ultimate will lead the way for the Switch this holiday along with Pokemon Let’s Go. How would older games suddenly hold them back? I mean, I’ve only heard the opposite true with Donkey Kong Country overshadowing Super Metroid, which came out months earlier in 1994. Same with Mario Galaxy overshadowing Fire Emblem Radiant Dawn and Metroid Prime 3.

By what means? 

Shadow made number #5 in its debut month, while Rise was outside the top 10. Good improvement. According to insider at resetera Super Mario Party did well, and Tomb Raider is four spots above that.

So rdr2 reviews are insane. That definitely further boost its sales.

Edit:  woops, didn't mean to submit that 

Tottaly different things, you talking about sequels compared to new game that's totally different genre compared to already released Nintendo games on Switch.

Also there is no rule when you talk if some first game selling better or worse than sequel, there are plenty different things that effect on sales of those games, hype behind those games, popularity and time of release, are some of things that effect. Galaxy 1 had much bigger hype than Galaxy 2 had, Zelda SS also had much smaller hype than Zelda TP, also it was released when majority of Wii owners already migrated to other platforms and also required addon that you need to buy seperate. Switch will definitely getting another 3D Mario and other 3D Zelda, its way early to say if they will sell worse or better than Odyssey and BotW, but IMO it will be hard because until those new 3D Mario and 3D Zelda arive on market, Odyssey and BotW will continue to be one must have Switch games for every new Switch owner.

First your point is very weak, second even going buy your point, Smash Bros is game that has huge hype and it will have biggest hype during holiday season and easily biggest marketing push along side Pokemon Let Go, that affects also greatly on buyers and even on parents when they are buying games.

well i honestly feel the same with ps4, RDR2 and spiderman are gonna hurt GOW legs big time imo. when talking about nintendo systems, it's usually  major nintendo franchises that do great numbers, well see it's just a theory of mine, maybe it's flawed but imo thats why nintendo games have such great legs, people buying nintendo consoles are just buying them for nintendo games. switch will have mario kart, mario odyssia, pokemon, and zelda to choose from, which is why i don't see smash having record numbers.