I think he means that Scipio was a great strategist/tactician but suffered in the political arena. This is true to a certain extent. Scipio was, as was Caesar a great communicator. He understood and utilized the average romans superstitious nature and used religeon to give the impression he was/his actions were devine or were derrived from the gods. Implying that he spoke directly with the gods. Scipio's time and Caesar's were far apart. Caesar cajoled, bribed and threw aside mos maiorum to acheive his political goals at Rome. Scipio stayed within the bounds of the law. Caesar broke the law to arrive where he did. In a way, Scipio's treatment was a precursor/buildup to the Grachii. Caesar would certainly have read about and learned from Scipio's treatment.