Well you would hope so but it's still not the same. Lopez wasn't in as good shape as the rest after his spell on his own whilst the contracts were being sorted over the summer. Without someone else pushing you, youre unlikely to train wuite as hard. Also it depends how much determination he has...
Apart from the fact there is a reason he isn't at a club, what use would he be severely lacking match fitness possibly even fitness in general. He hasn't been training so who knows what condition he's in. Yes he was brilliant even sporadically for us but we can't have passengers.