RJ Barrett’s big weakness looms over impressive Knicks start

Of all the negatives through seven games, the heartbreaking defeats, few blowouts, poor finishes and shoddy starts, there has been one positive for the Knicks.

A shining light amid the darkness, a reason to smile as they have stumbled to a 1-6 record, is RJ Barrett.

This being the Knicks, of course, there is a “but.” There always is, it seems.

As impressive as Barrett has been so far, averaging 18.3 points per game, dishing out 3.3 assists, hauling in 6.1 rebounds and shooting 35.6 percent from 3-point range, and doing all this while playing 37.1 minutes a night, there is his free-throw shooting.

It’s a Shaquille O’Neal-esque 47.6 percent. He has attempted 42 and made just 20.

“Slump” is how…