Why do scholars believe that basho revised his journal after traveling to the north?

Most scholars agreeing that only the first seven chapters of the 33, the ... Even Basho's travel journals, especially "Oku No Hoso Michi," are tightly controlled Only after he wakes does he know it ... Chuang Tzu are intended to express his own poetic purposes and do not parrot ... Basho believed that the notion of rensouce 

Why do you have to ask such hard questions.