Is sinus lift not needed if the sinus membrane is very thick??

Authors

The current tx plan is to place an 8mm implant in an upper molar area where the ridge height is approx. 7-8 mm. The surgical plan is to drill through the sinus floor quickly and carefully to achieve bicortical fixation without sinus lift. But my questions are: 1. if the sinus membrane is much thickened like this case, is there no need to worry about nicking the sinus membrane? 2. if the drill goes into the sinus membrane by 2-3mm in this case and drills back and forth, I am just curious if the sinus membrane gets torn?