Well it's interesting that you took it to mean aggressive attitude but I'm pretty sure he didn't mean it that way. He was referring to balance at the table. Yes, he did say "a little forward," but later on he mentioned it as "leaning forward." A former student of mine who was doing really well, asked me what I thought about him taking a workshop with a snooker instructor. I said, by all means, yes! When he returned, he was leaning forward in a pretty big way. He said he preferred to play that way, and sadly the only thing I could do was to watch his game deteriorate.For me it is not about leaning forward it’s about an aggressive attitude. Barry addressing it as the angle of the rear leg and calls for the weight going forward a little bit.
One of my flaws is to pop up like a cork. I don’t realize until I have done it but post flaw analysis tells me my apprehension led to a backwards inclination. My solution has me asserting an aggressive attitude with every shot. Slightest weight on my bridge hand helps stabilize my 3 point shooting platform. Slightest inclination forward with the rear leg emphasizing my aggressive attitude. Works for me.
I think Imac007 got it right. It's a snooker thing that may have it's origin with the fact that snooker tables are taller.