Sens vary by type. Some are small, some are big. My WC can apparently top our 14" long term
Your missing the point regardless of that its a perfect example of how googling and not stating where somone got the information from can lead to confusion and a misconception by the person who asked the question, they may believe that its a fact that they get x amount of inches.
Same could be said for someonw who keeps the fish. I have a sen that never passed 6 inches it wouldnt be correct for me to state that sens get 6 inches no more no less as a matter of fact. I can only state what my experience has been.
There really isnt a type of sen. It either wc or cb and if cb how good its genetics are. Both are senagalus cuvier There is the mythical sen. meridionalis but ni one gas actually kept it so who knows if it actuallu exists.
Same with wild caught just because (example) one endli or lap hits 24inches it doesnt mean all will.
Always a grey area