No, Krakuer does not cite any evidence regarding his analysis about alex relationship with his father.He believe that alex just got stuck in the middle of conflict between McCandless and the father. But, he is just basing the assumption on the relationship between McCandless and the father without knowing for sure how alex behave to the conflict.
The answer would be the formal operations stage. This stage starts at roughly age 12 and endures into adulthood. Amid this time, individuals build up the capacity to consider theoretical ideas. Abilities, for example, legitimate idea, deductive thinking, and precise arranging likewise develop amid this stage.
I believe it is 1 out of every 5