What he described implies that something substantially in front of the other targets would hugely throw off the weighting. It'd be fine if remaining shots reallocated but it sounds like they wont.
But all shots are fired simultaneously in any 5s increment, at least in an abstract sense. It would make no sense that you should be able to re-target once a target is decided for each fire-control in that time frame, that decision is based by the crews judgement. I also saw not indication for how the weighting system would work... I got the impression that it would become fairly random with a preference for any fire-control to target that which it are most likely to do most damage to.
In my opinion PD should work the same way... even if that would make PD less effective in general. But then again I think that the howl missile salvo mechanic need to be overhauled at some point anyway as full sized launchers versus box launched salvos is an anaemic issue in my opinion.