I started this from Halo5Follower’s vid.
SO…this is what i think.Chief has the chip to put medican bias in it .Medican Bias cuz cortanas chip was destroyed in the forerunners comporser,there could be some remainders of cortana in the forerunner world.So since medican bias is a forerunner,he could help chieff go and get some of cortana so then he goes to halsey to rebring cortana.And when Chief finds a remaider of cortana,he swaps mendican bias with cartanas remainder to finish the didact.( What could be H5).
ANd if thats not it then it would be cool