Rubuta ci gaba ga wannan sakin layi - Ƙa'idar ɓoyewa da kuma ɓoyewar kwanan wata yana nuna shakku game da amincin yawancin tushe na farko. Yawancin masana tarihi sun yi hasashen cewa John II na iya sanin wanzuwar Brazil da Arewacin Amurka tun farkon 1480, don haka ya bayyana muradinsa a cikin 1494 lokacin sanya hannu kan Yarjejeniyar Tordesillas, don tura layin tasiri zuwa yamma. Masana tarihi da yawa sun yi zato cewa an ajiye ainihin takardun a cikin Laburaren Lisbon. Abin takaici, gobara bayan girgizar kasa ta Lisbon ta 1755
ya lalata kusan dukkanin bayanan laburaren, amma an tura wani karin kwafi da ake da shi a Goa zuwa Hasumiyar Tombo ta Lisbon, a cikin shekaru 100 masu zuwa. Corpo Cronológico (Chronological Corpus), tarin rubuce-rubuce game da binciken Fotigal da abubuwan da aka gano a Afirka, Asiya da Latin Amurka, an rubuta shi a cikin Tarihin Tarihin Duniya na UNESCO a cikin 2007 don sanin darajar tarihinta "don samun ilimin siyasa, diflomasiyya, soja, tattalin arziki da kuma tarihin addini na ƙasashe da yawa a lokacin binciken Fotigal".