I'm not sure that Lee is a 5X better fit/talent than Quisy, expecially for the money and years.
I don't think that there's a linear relationship between money and talent/fit. You can't replace Lee on the floor with 5 of Quisy and play 9v5, so there's a premium on talent.
Yeah, there sure as heck isn't a talent/contract formula. Thank goodness, since it would take the fun out of criticizing contracts.
But since we're up on the hard cap, there are other roster issues that come into play by giving Lee $5M, i.e. no BAE to use while staying under the hard cap. Also, being for 3 years, we likely only have the mini-MLE next summer instead of the full MLE.
That BAE could also bring another big, for example (pick your fav).
Lee is a better player, gets to the rim, etc., but we now have JET, Green, and Barbosa who can do that.