Ali,
The pole and the knives are advances stages of the Ving Tsun System. Being so, they are for you to apply your Kung Fu knowledge and understand the nature of these weapons. They cannot be catagorized as mechanical "forms", thus is why it will differ from practicioner to practioner. No one is "wrong", unless they cannot explain what they are doing or not demonstrating Ving Tsun ideas and concepts (or doing something contradictory to). Hence, each member of the yip man clan may claim some basic foundation from which their students are to build from. There are stories told whereby seniors picked up the pole and played and that even back in the 50's there were very few who knew any of the weapons. Realistically, many people do not stay in the Kung fu long enough. There are some who say the weapons are not "practical", and this is their excuse for not training them. However their study is very profound, not obvious.
The pole represents a long range weapon. The techniques mimc the hand techniques whereby the fulcrums of elbow and wrist change positions from our body to include the pole as an extension of our body. The pole should be grasped such to hide the end by your hand and, when thrusted, hidden underneath your armpit for full extension. The pole covers your side center line. A good pole is about 8 to 9 feet, solid and tapered. The pole makes one sound, and should stop at a point. it's mastery makes it a powerful weapon, not one can easily enter your boundary as shown in various Wing Chun articles against the Knives.
Why question whether Yip Man knew the pole or not? No relevance to what you can get out of training it properly.
Good luck in your kung fu....
Moy Yat Kung Fu - Martial Intelligence