If I try to read some tea leaves here, the Jazz may really want Tre Johnson, enough to trade up with Philadelphia. However, a deal with Philly may be too difficult to put together. If the Jazz think Edgecombe goes at 4 to Charlotte (like almost everyone else seems to think) and the Jazz have concerns about Ace Bailey, then that would explain why they'd look at Jeremiah Fears or even Kon Knueppel.
In other words, the Jazz may not be comfortable with Ace for one reason or another and he may be the guy most likely to slip to #5.