The "other side" has not "just leaned against the wall." The "other side" has done something Floydian's "side" has not—done research and presented evidence. Perhaps he missed that part of the discussion. Here's the evidence...again:

Google Books
"perfect game" baseball: 14,500 results
"perfect game" bowling: 2,010 results

Google News
"perfect game" baseball: 1,449 results
"perfect game" bowling: 189 results

Floydian, what is "your side"s response to this evidence that, by a large factor, "perfect game" is primarily a baseball term in high-quality sources? And, pray tell, what sort of "research" are you conducting? Are its premises as neutral as the examination of closely parallel search strings whose results you see here?—