I don't trust the anonymous guy but it makes sense. sagna and Micah both failed to take the shirt off Zaba once he got a hold of it.
But having said that I think he'd get a good shot at it if he joins soon. Zaba is going to be knackered from back to back seasons with 50+ games and international tournaments tacked on the end. He looked exhausted for much of the season.
If this kid is as good as we're told, he should relish the challenge of proving himself against the best RB in the premier league and being his ultimate successor. And if he is good in midfield then he could pick up a few extra games there as well.