It looks like a no brainer to me too. Based on last seasons play we have a very average (at best) midfield excluding Gerrard, at least 3 of them (we all know who they are) are not LFC quality so why would we not sign this guy and move some of the deadwood out before they cost another manager his job.
Having said that I can see Snakeye's point, we need a RW and a goal poacher as well, so my call would be sign this guy along with a top class RW and a proven goal poacher. If FSG won't provide funding for this minimum requirement to continue the rebuild, then their ambition is in question as far as I am concerned.