no question the 4 seems like the obvious choice to start with
but there is a very small cut angle and not alot of room to not hit the 5
in addition you need to have just a" smidgeon" of left on the ball when it hits the rail to be able to have shape and not over spin it
do able but tougher than it looks imo
the 2 railer is on the perfect line to bank
it leaves a built in safety if you miss and hit it at pocket speed
plus you know mr 3 cushion would like that type of shot.......
dr. bill might not have been as facetious as you think......
........
jmho
icbw