zee944 said:

If those six copies are actually from three different transfers, you're in luck already. There may be just two different transfers. To use that median/average magic properly you'd have to use image registration technique first, which also takes a lot of dedication. The result could be easily better than the NTSC DVD yes, but it doesn't contradict with what I have said: it'd still be DVD quality.

More tests are needed anyway...

Noone can tell how the BD would turn out. But having a flawed, high resolution BD version to work with is a much better situation than having only SD materials.

...if it will be flawed, it must be seen which flaws are present, and if they could be fixed... for example, if the CGI effects will be "improved", those scenes cannot be fixed and should be taken from another source...