[ The occurrence of maize cob decoration on the pottery from Igbo Olokun is also an indicator that we may be digging the later period of the site’s occupation. If this is the case, then the date would be associated with the late production phase at the site. Of course all or any of these positions are very preliminary until more detailed and extensive work is carried out at Igbo Olokun and it's surrounding.] www.researchgate.net/publication/281149556_Archaeological_Investigation_at_Ile-Ife_Southwest_Nigeria_A_Preliminary_Report_on_the_2010_Test_Excavations Here^^ it seems an attempt at down dating the issue of the maize cob simply because it's maize, which would be problematic in explaining if earlier date of the pot shards were to be accepted, However, still have to take it in consideration,as a possibility
Just as we must consider the linguistic position of MWD Jefferies along with Fage and Oliver.