In what way does Usamov and Mosh make money on the docks - how? Honestly curious as to how you think this happens.
Not to answer your question, but, in my mind the money isn't made by them through the docks specifically, but rather 'their' investment will grow in value as the docks start to come to fruition. In much the same way that Peel recognised the value of Everton being there, and will benefit from it, Everton will benefit from what Peel can now expedit to creation.
I dont see Moshiri buying up any more land on LW as he will be open to fair market prices, and why get into a bidding war when the right people will raise the value if your initial investment?
The only reason we got the dock for "peppercorn rent" is that it directly benefits Peel. They're not going to reduce that positive uplift by giving anything away at mates rates.