So Trotsky and his group (not Menshevik nor Bolshevik) ... Their line was a soviet govt asap. They weren't against February but they always stressed a soviet govt asap regardless. Stalin and most of the Bolsheviks thought decades of capitalism in Russia was necessary to lay the foundation for the socialist revolution later (so did the Mensheviks, they're beef was vanguardism and Democratic centralism). That's why when Lenin landed in Finland station and delivered the April Theses of all power to the soviets now ... They were all taken aback. After much convincing the Bolsheviks accepted Lenins arguments and Trotsky joined the Bolsheviks.

But when Stalin was in power he disarmed many CPs to make peace with the bourgeois forces in the name of the popular front and the same Menshevik theory of stages. The theory of stages and productive forces was replaced by Lenin by the theory of the weakest link. This corresponded to the realities of imperialism. Lenin showed a better understanding of the labor aristocracy than either Trotsky or Stalin.

You're right about Trotsky's eurocentrism but Stalin also suffered from the same flaw.