Clarity for situational on-hit effects?

1. Does graves apply on-hit effects (like red buff) to all three people he autos?
2. Do all 3 attacks from the blademaster synergy apply on-hit effects like regular autos?
3. Does gunslinger synergy proc off blademaster synergy (ex: does GP attack an extra target from gunslinger for EACH of the blademaster attacks?)
4. Do gunslinger extra attacks proc on-hit?

If yes to all, then... Graves with BotRK could theoretically attack 3 times in a row from 6 blademasters, each of which hits 3 people from 4 gunslingers, each of which hits 3 people from his own ability, multiplying every single auto by 27. Throw on and multiply each auto by 45.