I've been thinking about that crucifixion image myself. This is a bit way out, but what I thought of is that Javert is only half of the image, it is only complete through the presence of Mabeuf. Javert it seems does not symbolise the Crucifixion on his own. That makes me recall that in the Gospels Christ is not the only man crucified, there are also the two thieves who gain symbolism and resonance through juxtaposition. Perhaps then Javert is not Christ but one of the thieves? Javert as the impenitent thief, refusing revelation even when it is right in front of him? I'm not sure, Hugo tends to be a bit more obvious with his comparisons. But I thought I'd throw it out