Historical background
Although Zhang Zuolin and Feng Delin were both born of bandits, after the Republic of China, Zhang Feng's armed forces gradually militarized, the gap between Zhang Zuolin and Feng Delin was also getting bigger and bigger, when Feng Delin still acted in the style of bandits, Zhang Zuolin had already considered comprehensively governing the northeast, so Zhang Zuolin, who had a higher comprehensive quality, easily defeated Feng Delin as the overseer of Fengtian, but Feng Delin fell behind as a deputy, and had to give Zhang Zuolin a hand, detailed analysis is as follows.

Zhang Zuolin is more flexible than Feng Delin and is good at handling all aspects of the relationship.
Although Zhang Zuolin and Feng Delin are both from the green forest, but the two have very different personalities, Feng Delin is impatient, likes to use knives and guns, not good at detours, on the contrary, Zhang Zuolin is sleek and old, good at dredging the relationship between all parties, so at that time, the Beiyang government was more inclined to zhang Zuolin in fengyuan when choosing the Fengtian overseer!
Zhang Zuolin is good at using and managing think tanks
The important reason why Feng Delin was surpassed by Zhang Zuolin, who was in the ascendancy of the latecomers, was that Zhang Zuolin was good at managing and using his think tank, and did not hesitate to attract talents at great expense, among which Yang Yuting, a young man who Zhang Zuolin boldly reused, repeatedly made strange strategies for Zhang Zuolin in handling relations with various warlords, and Zhang Zuolin's abundant talent was also an important reason for controlling the northeast.
In addition, Feng Delin is far inferior to Zhang Zuolin in terms of talent building, Feng is only good at facing the struggle, only valuing military generals, and is not good at using wisdom and planning, so in the tiger and dragon pan, the northeast of the sudden change of wind and clouds is far less than Zhang Zuolin's ability to deal with, and the position of the Fengtian Overseer will naturally not be obtained by others in the heart of the ambitious Zhang Zuolin.
At that time, celebrities and powerful figures in the northeast were more inclined to support Zhang Zuolin
Because Zhang Zuolin was relatively low-key in handling relations with celebrities and other circles, he was good at showing weakness to win over the celebrities and gentry in the northeast, in addition, Zhang Zuolin got along well with the brothers who fought together in the northeast, and was more inclined to support Zhang Zuolin in terms of the selection of the Fengtian Overseer. Because of Zhang Zuolin's meticulous operation of the northeast, the Beiyang government pushed the boat along the water to give Zhang Zuolin the position of overseer!