ANY involvement between Apple and Tesla would cause a violent move to $700s and would wipe out the $TSLAQ meme for good. It could be Apple purchasing a stake, software involvement, anything.
Apple has better chance to help incumbents with building software stack.
Apple can't help Tesla for h/w,s/w, auto, battery, solar, power wall ...
So it's only monies - and they didn't make a move in the low 180's ... so I think that time has passed as well.