I would agree with that, except it leads to the conclusion that a character with MI in the area of an EBT would be grappled by tentacles, and surrounded by his five identical twins who are acting like they're being grappled even though no tentacles are going near them. (Or more likely, the images will have illusionary tentacles to grapple with, which won't affect the EBT in anyway, but will still make them identical to the MI'd character.)
A better question might be what happens to images when a creature attacks the caster, and initiates a grapple? If he gets lucky enough to grab the real guy, what do the images do while the real guy gets grappled? Watch? Or do you suddenly have a pile of identical images and grapplers?