This is the passage that caught my eye. I wrote Chaput and told him that I thought that that was a loophole that many would try and drive a semi through. Rather than using the GIRM as a guide some priests and liturgists use it to see what isn't mentioned and then exploit said omissions. "The GIRM doesn't say I can't celebrate a clown Mass, so I guess that means that I can." Judging by the response I got, I now know how Scalia feels.