I was going back reading past chapters and I came across this page.
Even back in part one Orochimaru had such a keen interest in Sasuke and his eyes. This was before Sasuke even hit 3T and already he noted that Sasuke's eyes had a potential power that could surpass Itachi. This was not EMS, but some latent ability hidden within Sasuke's eyes. This power that Orochi that Orochi foresaw in part one is probably the reason that he thinks Sasuke hasn't hit his max. I wonder what this power is???