I said it in a different thread, but IMO it comes down to this: LBJ wants enough talent around him to win titles, but not so much talent that LBJ isn't universally acknowledged as the overwhelming reason for winning the title.
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It is an incredibly small window to thread, and LBJ isn't great at evaluating talent. There are some incredibly talented shooters that would thrive alongside James, but he hasn't pursued them.
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I feel that LBJ wouldn't like it if some SG or SF shot 48% on 10-11 threes a game. That person would get too much credit, much like Kyrie got too much credit for the lone Cleveland title. LBJ got the most, but people game Kyrie lots of credit as well.
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I think LBJ sees Kevin Love as a perfect teammate. Good, but not too good, and seen as a guy that needs to ride the coattails of superior palyers (ie LBJ).