Well the answer is simple, in my opinion.The style known as jut sow was invented by someone else who was unknown and it is not 8 step.Tainan learned both wah lum and 8 step and he says they are not the same.
So the questions that arise are...
1)When and by who was jut sow founded?
2)What makes jut sow different from the others and 7 *?
3)How was it founded?
killer kung fu commando streetfighter who has used his devastating fighting system to defeat hordes of attackers in countless combat situations