Choosing the successor of Timur Lang

It is said that Timur Lang was born lame and one leg was shorter than the other.
One day, he gathered all the commanders of his army around a hill covered with snow, on top of which there was an oak tree, in order to determine his successor.
His chiefs were encircling the hill.
Timur said: Everyone move towards the tree one by one and whoever has a straight line will be my replacement.
They all did this and reached the tree, but when they looked at the footprints left on the snow behind them, they all saw that they reached the tree, but all of them were zigzag and crooked. Until the last person Timur Leng himself walked towards the tree and to his surprise, even though he was lame, he reached the tree in a straight line.
Why do you think Timur could not choose his successor on that snowy day?
What was wrong with his generals that they could not move in a straight line like Timur and replace him?
In the story of Timur Lang, when the narrator asks the reason from Timur himself, Timur answers: The goal was to reach the tree, I was looking at the goal and walking, but my troops were looking at their feet, not the goal.

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