Upvote:1
The Americans were on Luzon, and the Japanese had air and naval superiority, so reaching Mindanao was out of the question. The initial landings of the Japanese cut off the US troops, deployed near the capital of Manila, from what hills there are on that island.
The main requirement of a guerrilla campaign is to either be able to escape the occupying army or hide among the locals. The large garrison of the Philippines could not escape nor blend in. The only thing scattering could accomplish would be to have the locals punished for sheltering them.
Some special forces might have been able to work on the island after the fall, but the large peacetime garrison could not.