I am always a bit doubtful about the phrase, 'build around... a single 'player x'.
I understand (I think!) what is meant by that phrase, 'player x' is your key/best player and the teams style of play, tactics, etc. should be geared to their particular strength's. The problem always comes when 'player x' is off through injury, or loss of form, etc.
Brian Clough's old adage about the 'spine' of the team was the thing to build around, this springs to mind as the best approach, the spine being; a consistent GK, a dominant CB, a resolute DM and/or creative AM, a leader of the line and a 20 goals per season CF. To such a spine you could add, width through wingers or wing-backs, flair through a No.10, CF+1 up front as a pair (one going long, one going short), energy in tackling, or a 'box to box' capability with other midfielders, etc.
Also how long will it take Fernandes to settle in, get with the pace of the PL, try to work out what the rest of the team are doing (especially when it appears at times nobody knows and they all seem to train on a different pitch)? Will Fernandes replace Carrick, (has anyone) is that what we need? January signings are notoriously difficult transfers to bed down, look at how long it took Evra and Vidic, in the present state of chaos seeming to reign within the club and its fan base.
Lets not set up Bruno as our 'saviour' figure, it will be difficult enough as it is!