Thank you John, for responding and obviously spending some time on looking into this. I see that you frequently respond to such questions and have on 20 occasions received the 'Best Answer' sticker. This must be a source of pride for you.
I am sorry if I gave the impression that the whole thing was wrong though. That was not my intention or my belief.
I am right with you on the dates for John Corbet and have some other evidence that I have researched that, I believe, could be usefully added to the profiles as research notes. For example, I can find Robert Corbet (1507) and Roger Corbet (1530) as Sheriffs of Shropshire but not John in 1526. There is also little evidence for John's third wife, Agnes, (others including a PhD student and a member of the Magna Carta Project also take this position) but I have recorded what I have checked and would like to add this information as research notes to the profile for John to save others doing the same research in the future.
I also reviewed the Visitation of Shropshire, spent an entertaining few hours reviewing the Henry VIII Letters and Papers Foreign and Domestic (Letters and Papers, Foreign and Domestic, Henry VIII | British History Online (british-history.ac.uk)) and the Owen and Blakeway book, History of Shrewsbury (A history of Shrewsbury [by H. Owen and J.B. Blakeway]. : Hugh Owen, John Brickdale Blakeway : Free Download, Borrow, and Streaming : Internet Archive).
The History of Parliament page you quote makes much use of the Visitations or the Harleian Society which I have not been able to prove in other ways and brings us back full circle. Similarly, I was unable to attend the National Archive so have not been able to review the detail of the various documents identified as being relevant to John Corbet and referred to in that page CORBET, John I (by 1500-55 or later), of Leigh, Salop. | History of Parliament Online (histparl.ac.uk).
I am interested in your observation (and that of Suzanne below) about FamilySearch. My impression was that the records I was referencing were taken directly from images of, in this case, parish records. I appreciate that these could be mis-transcribed (as has been the case in the latest 1921 Census, for example) but are you suggesting that the records are in themselves somehow corrupt? Are you suggesting something beyond the possibility that the records have been mis-transcribed? If so, could you explain further?
Lastly, I am working with my Orphan Trail 'Trailblazer' (mentor) Susie who I now understand can make whatever amendments she believes are appropriate.