Sergi Roberto looks a proper CM and not the left sided playmaker we are led to believe we are after, and we been linked with him for ages.
A possible explanation , also coinciding with rumoured McCarthy unrest. I believe RM knew the score of our budget from the start, and had decided early on that he needed to cash in on one of the big assets we have to push us forward, and he has decided it is McCarthy, so many stories been leaked about him would support this. When Coleman interest came about , it was shot down very fast, seems we are trying to shoot down Stones interest, but McCarthy stories still persisting. So Sergi Roberto comes in as his replacement, and the Rest of the cash we get for McCarthy (along with 8m we seemed to have for a CB) put towards a Left sided playmaker and CB, and this would support Martinez saying there will be late deals, as the latter two would only happen after the Sergi Roberto purchase, hence later in window.
Only a theory, but given whats in the press it may well be possible