General opiate inquiry

[norcolepsy]

First off, is the power of a given opiate in direct porportion to its depency rate? for example, if one was looking at an opiate equivalency chart and saw that a chemical like hydrocodone was rated a '3' in strength and its cousin oxycodone was a 6. Does this theoretically mean that A.) it will take twice as long to become physically dependent on hydrocodone? and B.) Following the same guidelines, if swims air conditioner were to take 10mg of hydrocodone one day and 5mg of oxycodone the next time, and continued that regimen, would that delay the onset of physical dependency? if so, how effective would it be? thanks