Think of wire like a hose for electricity the bigger the hose, the more electricity can flow freely, less restriction. Ohms measure the flow of electricity in the wire like water pressure in a hose. As the hose gets smaller the more restricted the flow gets. The length also plays a factor in the Ohms, the longer the wire, the higher the ohms.
What I know about placing the wire close to positive does only one thing,. It shortens the wire in turn dropping the ohms by a very small amount. All the videos I have seen mention to do this, but none have really explained why. But I have noticed with the RBA I have (T2), it seems to make a difference in it being more stable, meaning the ohm readings don't bounce when i check it.