Trotsky was also previously an anti-boleshevik from the menshevik camp, and, if I remember correctly, never changed the majority of his opinions from that time.
He wasn't menshevik per se, he was always in the "mediator" camp between mesheviks and bolsheviks, but in practice it looked like the political opportunism to position himself in the limelight and trying to work as the tip of the scales, though that didn't really worked because mensheviks weren't really much interested in real reconcilliation and bolsheviks didn't trusted Trotsky. He did got plenty limelight in the communist inteligentsia circles due to that though. Lenin constantly criticised him for this shaky and unprincipled position which proven how Trotsky either failed to understand the situation, or did but still decided to sit on the fence.
He wasn't menshevik per se, he was always in the "mediator" camp between mesheviks and bolsheviks, but in practice it looked like the political opportunism to position himself in the limelight and trying to work as the tip of the scales, though that didn't really worked because mensheviks weren't really much interested in real reconcilliation and bolsheviks didn't trusted Trotsky. He did got plenty limelight in the communist inteligentsia circles due to that though. Lenin constantly criticised him for this shaky and unprincipled position which proven how Trotsky either failed to understand the situation, or did but still decided to sit on the fence.