No, that wasn't it. I wrote a lengthy reply to your last post right away, but got called away before I could finish and remained too busy to complete it for several weeks. By then the thread had gone stale, so I never put the final touches on it and posted it. I'll read through the thread again next week to refresh my memory and then continue where I left off. And if memory servers, I already addressed the sentence you put in bold (above) in a previous post. It was at least answered indirectly, but I'll be sure to address it directly next week.
RT-
Your final argument was to misconstrue Fr. Cekada’s argument, and make him say that since the phrase spiritus principalis is equivocal, the form is therefore invalid.
You then responded to your own straw man by noting that other words used in the form of other rites are also capable of other meanings, but those rites are not on that account deemed to be equivocal.
I then intervened to say that Fr. Cekada’s actual argument is that whatever equivocal meaning one may choose to assign to the phrase spiritus principalis, nothing suggesting the conferral of episcopal orders is among the possibilities (hence the doubtful form).
That is where you left the thread, and naturally therefore, explaining why/how spiritus principalis conveys (in any sense, much less an unequivocal one) the conferral of episcopal orders will need to be your starting point.