Apparently harder than you did. Of the two of us, only I found a source that agreed with you, likely your original source. Not surprisingly, you brought a paper from science rather that a creationist source, but also not surprisingly, it doesn't support your contention. The fact of flagella and the secretory system having evolved naturalistically is assumed, as there is evidence it did and none that it was intelligently designed.
The creationist apologetics I linked you to was entitled, "Why the Type III Secretory System Can’t Be a Precursor to the Bacteria Flagellum" your claim. About itself, this site says, "Evolution News & Science Today (EN) provides original reporting and analysis about evolution, neuroscience, bioethics, intelligent design and other science-related issues" and "The articles published at Evolution News are copyright by Discovery Institute"
Sorry, but intelligent design isn't a science-related issue. It's religion.
The article says, "Now under normal evolutionary reasoning, one would take this kind of phylogenetic evidence to indicate that the flagellum long predates the T3SS, and that the T3SS is in no way a precursor (or closely related to a precursor) of the flagellum. But don’t expect evolutionists to use their normal reasoning when trying to oppose potent arguments for intelligent design."
I'm pretty sure that this or some similar creationists site was your source.
Recall that I also posted the following, something you chose not to comment on, so I will:
And this panned out this time as well. It's been a 100% effective rule to just reject all creationist sources and insist that the apologist provide documentation from mutually acceptable sources, which on the matters of science, will be sites dedicated to disseminating scientific information rather than promoting creationism.
Incidentally, you're not alone. All creationists ignore the truth of that comment - that there is nothing known only to creationists, and that if only creationists are saying it, it is incorrect. It's perfectly reasonable to request that you use a science source like the one you posted, and as usual, this exchange confirms my claim that creationist sources are appropriately rejected out of hand, and if you go to bona fide science sites and sources as you did, you find nothing supporting creationism.
You'll have to speak for yourself there. I told you how I separate correct ideas from incorrect ones, at least how I do it as a secular humanist. It's worked out very well for me. Sorry I couldn't share any of that with you. You'll just have to keep your bad beliefs if you are unwilling or unable to test them empirically to determine which work and which don't.
Science is not just another tool. It is the only tool capable of accurately describing how physical reality will behave under various circumstances. Watch what happens in the world this year as millions or billions of people reject science. Nothing can substitute for science in developing an optimal response to this disaster. Without it, you might listen to antiscientific yahoos and kill yourself with hydroxychloroquine and a bleach chaser.
Religion, by which I mean faith-based thought about the existence of unseen gods and what derives from it, can tell us nothing of value. Just contrast evolutionary theory with creationism, or astrology with astronomy. In each case, the former, an evidence based program, has generated useful ideas that can predict outcomes accurately, whereas the others, both faith-based systems of thought, are also both sterile. Neither idea can be used to make life longer, safer, healthier, less laborious, etc.. So, I culled them from my mental map to my benefit.
Anyway, I guess we're done. That's what I do and it has helped me navigate life more successfully. I tried to share it with you, but was unsuccessful. No problem.