What did Jim think of the cook?

Jim thought the cook deep, ready, and clever.

I watched the cook narrowly. But he was too deep, and too ready, and too clever for me, and by the time the two men had come back out of breath and confessed that they had lost the track in a crowd, and been scolded like thieves, I would have gone bail for the innocence of Long John Silver.

Jim found Silver the most interesting companion and one of the best possible shipmates.

On our little walk along the quays, he made himself the most interesting companion, telling me about the different ships that we passed by, their rig, tonnage, and nationality, explaining the work that was going forward—how one was discharging, another taking in cargo, and a third making ready for sea—and every now and then telling me some little anecdote of ships or seamen or repeating a nautical phrase till I had learned it perfectly. I began to see that here was one of the best of possible shipmates.