Here's an article that gets into some of the analytics (efficiency) of why Morant has taken a huge leap in these first 3 games
www.espn.com
And you won't be surprised that I found this part of the article to be the most relevant to our upcoming season:
Morant's shots were in the top third in difficulty among players with at least 500 attempts in 2019-20 and 2020-21. Among players who have taken at least 30 shots this season, Morant's attempts have been league average in qSQ.
In part, that improvement in shots reflects Morant cutting midrange attempts almost entirely out of his offensive diet. Just two of his 69 shots this season have come between the paint and the 3-point line, according to NBA Advanced Stats, a rate down by 50% from last season.
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Basically, his shot difficulty has gone way down and almost all of it is attributed to the fact that he's cut out the mid range jumper.

Ja Morant is nearly unstoppable right now -- how legit is his Year 3 leap?
Memphis' explosive point guard needed just one week to take the NBA by storm. Kevin Pelton examines what comes next in Morant's evolution.
And you won't be surprised that I found this part of the article to be the most relevant to our upcoming season:
Morant's shots were in the top third in difficulty among players with at least 500 attempts in 2019-20 and 2020-21. Among players who have taken at least 30 shots this season, Morant's attempts have been league average in qSQ.
In part, that improvement in shots reflects Morant cutting midrange attempts almost entirely out of his offensive diet. Just two of his 69 shots this season have come between the paint and the 3-point line, according to NBA Advanced Stats, a rate down by 50% from last season.
----
Basically, his shot difficulty has gone way down and almost all of it is attributed to the fact that he's cut out the mid range jumper.