Pell is a unique case mainly because we see him carry the bomb into the sky and see it explode.Only if it makes any sense. Pell surviving a huge bomb even though he himself was carrying it? No sense. Especially since Pell is a minor character, no real reason for him to survive there. It's unlikely he will play much role in the future, only in the background if he does. Pointless.
It's like if Deidara would have survived his 10 km blast with him as the epicentre.
Now a possible theory as to why he survives the explosion is that right before it exploded he dropped it while still flying upward.
Thus creating a good degree of distance between him and the explosion to not be fatal but still send him flying.