Bale started as a left back so will have decent defensive skills (despite the massive Spurs non winning streak with Bale at the start of his Spurs career)
Bale has a pretty good delivery on him, shown this many times.
At full speed no one can seem to catch him. This is key for Alves when he starts 20 yards deeper than the opposition defence and makes the run in behind for a diagonal pass. Could Bale create the same effect on the left?
The only thing that would worry me about Bale is whether he has the stamina and determination to get back and defend like Alves does.
Would Barcelona be even interested in this type of the player or are they just happy to have an Abidal and have a defensive player on the left to make up for Alves being so attacking?
I'm only speaking theoretically, this probably wont happen. I'm just interested about;
A) How Bale would do playing as a left wing back constantly now he has improved his game significantly (he did a pretty good job for Spurs away at Stoke)
B) If he'd be able to create the same type of attacking outlet that Alves does on the right for Barcelona