This kind of makes it sound as if he did it all on his own. A better way of putting it would perhaps be "Who led the Parliamentarian army to victory over the Royalists, led by the future King Charles II, in the Battle of Worcester ... ?"
Having said that, this is the kind of question that might provoke a response along the lines of, "Who else would it have been?"
In fact it might well have been Sir Thomas Fairfax, who commanded the Parliamentarian armies through the First and Second Civil Wars.
The Parliamentarian army by this time (1651) was the New Model Army, which was formed in 1645 (towards the end of the First English Civil War) when Parliament decided that a professional army was required and Parliamentarians should decide between military and political careers. It was led from the start by Fairfax (with Cromwell as one of his senior officers). Following the defeat of the Royalists and the execution of Charles I in 1649, Fairfax became unhappy with Cromwell's radical policies and ceded command to him.
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