As long as Lenin had him on the arm reach. Trotsky was pretty capable so he was one of the several guys being send to put out the crisises through the country, but despite usually doing good work he often screwed something and thus there are moments in the Lenin works and correspondence from that time, when he is like "Trotsky did WHAT" after reading reports.
He had quite a large role in the revolution
As long as Lenin had him on the arm reach. Trotsky was pretty capable so he was one of the several guys being send to put out the crisises through the country, but despite usually doing good work he often screwed something and thus there are moments in the Lenin works and correspondence from that time, when he is like "Trotsky did WHAT" after reading reports.