Seriously I agree with you though, I haven’t heard it discussed anywhere other than @Tom_Gilroy’s excellent work. Each finger should release right as the next finger is playing because then you’ll have the duration of 2 more fingers until you need it again. If you drum your fingers on a table as fast as you can (ring finger, middle finger, index finger is very natural and easy to repeat fast), you’ll probably find your fingers want to do this without you even thinking about it.