There is a purpose to why we are all here is what we are taught. We are in a constant endeavour to find the purpose and fulfill our obligation. There is a very famous Zen Koan which goes like this "If you meet the Buddha on the road, kill him".
Like most things in Zen, it is up to the individual to derive his own meaning and so there are many interpretations of this. The one I tend to agree with most is that it is not possible to see a Buddha outside you. Buddha is inside you, in fact you are the Buddha. It is not for one to replicate, but to find your own. And my belief is that it will be different for each. One cannot find a purpose outside, maybe there is no purpose at all and there is no shame in that. Enlightment might be in just understanding that there is no purpose afterall.
