I heard is said that the Rebbe said that one must seek out and attach themselves to a tzaddik; he did not say which tzaddik, nor did he say they should attach themselves to him (a very important distinction)! One must seek out a tzaddik who can raise them to the next level. This may not be the tzaddik they are currently attached to, because that tzaddik may not be a the level the individual needs at that point in their life (they may be at a higher level or a lower level, therefore, they will not be able to raise the person). Hence, one should not trap themselves into thinking that the tzaddik of my father and my father’s father is the tzaddik for my needs.