Ian
my ball track is an inverted track. ie: track away from fingers,
nearer to thumb
i was just following what i read. 
Airgrinder
It's very true to say that the power of a ball is generated by the
body and legs of a bowler, not the arms. Hence your idea of the
momentum transfer is correct. Faster ballspeeds doesn't mean your
arms throw harder - it means one's lges move quicker so that when
the slide ends at the foul line, the extra inertia is given to the
ball to avoid falling over. Bowling is all physics.
But the observation about whether or not the hands should move
quicker than the feet is debatable because it is very subjective.
It varies from stroker to tweener to power players, not to mention
the hybrid types in-between.
Basically, its like this: there should be a slight delay between
the end of the slide and the hand arriving at your ankle so that
there is ability to create what is called 'leverage'. This is where
the most action can be imparted to the ball - when it is next to
your ankle. And it is best to have the slide end first because it
is more advisable to 'hit' the ball while one has a 'stable'
foundation, don't you agree? The best bowlers do not lose balance
and fall over no matter how much lift they impart because of this -
they have strong and stable lower bodies.
This difference in upper and lower body timing differs in people.
As Chuanish has noted, power players need to create so much
leverage that their slide is basically just planting their foot
down and ripping their hands through the ball. When their plant
ends, the ball is usually only about waist-high behind their
backs!! 
Conversely, strokers have a more
"in-time" timing (both end almost
the same time) because they focus on accuracy, which
requires more stability below.
Consider this: one of the greatest bowlers of all time, Marshall
Holman, was legendary for his powerful release which was peformed
mid-slide! While the newer generation of power
players such as Robert Smith still have incredible balance at the
line. Chris Barnes has near stroker timing, but still gets plenty
of revolutions on the ball. Airgrinder, you bowl with Yvonne,
right? Watch her timing - its one of the gems of her game. The
upper body is just slow
enough to create leverage without sacrificing undue accuracy.
Bottomline: it all depends on which works for you. A good coach
doesn't change your stlye - he/she works on improving it.
P.S. For those out there who haven't figured out by now, bowling is
a sport you have to be fit all over to play well, not just he
master arm. Amleto Monacelli jogs 5 miles per day
while preparing for the PBA season. How many of us jog even 2
kilometers a week?
Power comes from the legs. 
