Footwork against pace is overrated. Many of the greatest modern test batsmen hardly move their feet at all against quick bowling. Most important thing is to get into a good balanced position in line with the ball that gives you the chance to react to any movement off the pitch.
Jennings bats like a man with a stiff back.
your absolutely right. But please don't confuse Jennings with some of the greatest batsman playing.
the best comparison is Trescothick, tallish left hander with minimal foot movement but a weight transfer and fantastic hand eye co ordination.
Tresco was one of our best openers, a completely different class to Jennings