Pratyeka Buddha means the dharma is gained through one's own enlightenment, so there is not too much power in it, but at the most only for self enlightenment, or for passing the enlightenment to a couple of other people. The enlightenment comes from the incidental right choice of method during spiritual practice which is not one's real method but only makes him succeed by chance.
Pratyeka Buddhahave practiced for a long time life after life, and now becomes Buddha naturally. If we haven't practiced very well life after life, but we now meet a great spiritual practitioner who has a lot of merits, who may also share a little of his merits with us and pull us up to a higher level.
A great master is just like a living Buddha. You will have all the merits if you listen to him; if you don't listen, nobody will accept you as disciples and you will have no merit even if you go and worship all Buddhas of ten directions and three periods of times.