There are always arguments from different people about Lin Biao.
Let's look at the 推背图. 第四一象 clearly shows that Lin played key role in the revolutionary period with his power in the army.
第四一象 甲辰 离下离上 离
谶曰:
天地晦盲 草木繁殖
阴阳反背 上土下日
颂曰:
帽儿须戴血无头 手弄乾坤何日休
九十九年成大错 称王只合在秦州
金圣叹:“此象一武士握兵权,致肇地覆天翻之祸,或一白姓者平之。”