Originally posted by: proteeti
I'll give this a try.
First off, the Kuru dynasty always believed in Karma over birth.
Duryodhana was extremely hotheaded while Yudhishthira naturally tended to think before act, this is what made him more worthy.
Remember the bird's eye test? In that, although Yudi did not pass the test for an ace archer, his observation was: he saw the bird, the trunk of the tree, the squirrels, the other birds and also the ants crawling on the ground.
In a mere few seconds he had noticed and processed the entire ecosystem of that tree. This was a very clever metaphor on the part of Vyasa which showed us the 'yogyata' of Yudhishthira as a King who would be able to keep a close eye on every little detail in the entire kingdom.
Duryodhan would not stand a chance there. Dury was a great warrior and a good administrator, but Yudi was a born "Manager" and the King needs to be vigilant everywhere and not just on the battleground; the king needs to make people do what they do best, and not jump in and do everything himself (that was one of Dury's shortcomings).
And even if we look at the eldest son rule, the rule is not for the eldest son of the eldest brother, but the rule stands by the "eldest" brother, which was Yudi again.
I hope I could help. 😳