He could have entered by the pilot's ladder that has been hung out for his benefit. But no, he had to do it his own way - climbing through the pilot boat's rigging and taking a very long step onto the freighter! :)
Care to explain? I have had a glass of thought quickening juice, endured five minutes of cold shover, and have leafed through a refreshment course on semiotic signification and symbiotic symbolism, but as of yet I have no idea of what you are hinting at.