Dropping/lightening in 3rd pregnancy

I previously read a headline from an article that you dont drop in your 3rd pregnancy. I thought it was odd. Then my doctor mentioned it at one of my appts but since shes always Trying to keep appts short I dismissed her to ask other questions I had in mind and regretfully didnt ask WHY. ...very obviously i have dropped a few days ago. I can breath again! I feel different. My sons feet are now longer at my ribs, they are now near my belly button. Dr. Said "you are carrying a bit low for 3rd baby." And of course I still want to know why it is said that 3rd pregnancies "dont drop". I did nothing different 💁 any knowledge in here on this? Dr. Google isnt helping