I would be cautious about this whole approach.
I do not think you should normally use Cawley as a source for this type of conclusion, especially if other better sources disagree. Indeed, the type of conclusion you are proposing is a very strong one which implies that all sources possible have been checked by Cawley before making his statements, which is certainly not how he works. He likes to propose new things as he works slowly through various sources, but he often has to change them later, and this often leads to misunderstandings here on Wikitree.
Furthermore, it is inevitable that to some extent the records for things like titles are incomplete, and so (1) to some extent we are forced to use conventional numbering to some extent, based on some authority, which might sometimes be questionable (2) in this particular case, the fact that a descendant said or implied that his ancestors used a title is a kind of source, in a "beggars can't be choosers" kind of way.