The argument does show up in Leo's November Application for Emergency Stay to the U.S. Supreme Court, but only in the most passing way. He devotes a couple of pages to arguing why John McCain is not a NBC, and then has only this to say about Obama:
"That being said, petitioner regretfully submits that since candidate Obama was born to a Kenyan father, he also is not eligible to the office of President since is not a "natural born citizen" by the Constitution."
That's it. No explanation, no sources, no argument. Just a declarative sentence. And a sentence, rather amusingly, coming immediately after Leo's statement that if Obama only released his birth certificate he could "put this issue behind him forever."
I won’t argue your point that Donofrio’s opinions have evolved over time. I think that’s a natural progression as one discovers more evidence to support one’s allegation. If Donofrio made that statement about the BC, he has completely reversed his opinion on that subject, and rightly so.