Okay, bear with me for a minute. Let's just say that MacArthur successfully pulls off his double retrograde manuver into Bataan, as he historically did, with all of his troops, equipment, but not enough food. After the first major Japanese attack on Bataan that drives the Filippino-American forces partially down the peninsula, MacArthur mounts a blitzkrieg style attack and counterattacks using the two main north/south running roads with all of his armor, anti-tank gun mounted half tracks, support vehicles and troops under a friendly artillery barrage from his still sizable number of artillery pieces. Hindsight being 20-20, we now know that the Japanese never outnumbered the Filippino-American forces on Bataan during the campaign, something that the USAFFE forces never knew.

Let's say that MacArthur's mobile armored forces break through and gets well into General Homma's rear, cutting off the main Japanese Army from any support behind them. How much death and destruction could they mete out? Could the USAFFE Forces catch Homma's forces in a pincer movement, crush them and turn the tables temporarily on the Japanese?

Granted, given the time frame, there were only a few dozen P-40 and P-35 fighterplanes left in his air force, but they might have kept Japanese air support at bay. Also, considering Bataan's double canopy forests, how much would that have limited the effectiveness of a USAFFE counterattack?