Advice on the Proper stance from the GREATS

[BCBUD]

Here is what Wlad klitschko has to say about position of the shoulders.http://m.youtube.com/watch?v=GlKuVxlaPcI 2:19
Wlad wants a balanced stance with the weight over the center.

@9:00 of the same video Lennox Lewis wants the weight over the center and the shoulders level. Hear how he like Wlad discourages unlevelled shoulders.today we see a lot of trainers having their fighters put the left shoulder up.according to these greats who could be classified as the greatest heavyweights of all time they want the shoulders level.