Actually guys I think I just might get this one AND CiG together if I like how it's done. The major obstacle before Hannibal (apart from the logistical nightmare of sustaining his army in northern Italy) was political opposition back in Carthage. In fact, had he received the proper reinforcements he asked for, Rome would have fallen.

He destroyed several Consular armies and managed to outmaneuver the biggest one, which had set sail to Spain. Upon returning to Carthage and dumping a miniature mountain of equestrian rings, and asking to get more troops, the politicians replied that "he obviously was doing well enough as it is". And Rome was notorious for her ability to churn out full fleshed out armies within the span of months to a a few years. I daresay as brilliant as he was as a strategist and tactician, he lacked Caesar's political cunning.

Not to mention that Scipio was just a brilliant a commander, who had the full backing of Rome and her armies.