In my familiarity with Buddhism, mainly Chan Buddhism I think, a Buddha is a fully enlightened being who escapes samsara and is able to rediscover and teach the Dharma. There have been many Buddhas in the past and there will be many in the future, but only one fully enlightened Buddha appears in the world at a given time.
An arhat and other enlightened beings can also escape samsara, but they do not rediscover the Dharma on their own or establish a new teaching in the world the way a Buddha does.
A Bodhisattva is someone who will become a Buddha in the future and is delaying final Buddhahood out of compassion for all sentient beings, and Budai is a specific Bodhisattva who is traditionally regarded as an incarnation or manifestation of Maitreya, the future Buddha.
Not an expert but this is how I'm familiar with it.
A tour is the ammount of separate times they went to grow heroin and kill innocents no?