I've had riders tuck behind me, even cars when running in the desert on my GL1800...
Between the Hondapottamus's four 55 watt stock lamps, a pair of PIAA 910s under the mirrors (110 watts ea) and a pair of PIAA 1100x pointing to the shoulder I looked like I was coming in for a landing ;-)
And I still hit that dang lion! Maybe your friend is on to something with his probability analysis ;-)
Rob in New England