I'm not saying there is another defect popping up, there is several more to be dealt with, fwiw I think the itty bitty calves are a form of dwarfism and that I believe with a little pedigree analysis there will be a common ancestor for itty bitty and snorter, if not the long heads too.
I haven't named any names, nor will I, but there is another distinct line that will be implicated in the itty bitty's providing it is determined to be genetic (and the sire to carrier flush should demonstrate that) but again the other line will share a common ancestor.
Also, I believe that between Dr. Beever and the AAA there is a far more proactive and aggressive (in a good way) attitude to dealing with genetic defects, testing will offer some avenues of redemption for affected lines but some may be heavily discriminated against regardless of tests as there will be issues of trust concerning some of the propagators.