I don't think Josh will be a star, I don't think there are many on this board who expect that. There is a ton of reason to believe he can be an important and solid contributor to the team.
Career 2FG%:
1) TJ Cline: 62.5%
2) Terry Allen: 56.9%
3) Josh Jones: 56.5%
4) Deion Taylor: 51.4%
5) ANO: 50.3%
6) Trey Davis: 48.1%
7) SDJ: 46.2%
8) Kendall Anthony: 43.9%
9) Marshal Wood: 38.7%
Career 3FG%:
1) Kendall Anthony: 41.7%
2) SDJ: 37.8%
3) TJ Cline: 36.3%
4) Josh Jones: 32.3%
5) Terry Allen: 29.4%
6) Marshall Wood: 28.8%
7) Deion Taylor: 28.0%
8) ANO: 27.4%
9) Trey Davis: 22.4%
Josh Jones is a significantly better offensive threat in terms of both 2pt and 3pt range than any other option we have at the 3. That is why people think he will be important, he can help out on offense. He doesn't need to make big strides, if he can put up his career percentages and play decent defense he will be a big boost to our team. When he plays we have another legitimate scoring threat, it helps the entire offense out when we don't have to play 3 on 5.
And another way to look at the (limited) Josh Jones stats, using points per shot from last year's team:
Nelson-Ododa 179/126 = 1.421
Terry Allen 454/331 = 1.372
TJ Cline 413/314 = 1.315
Kendall Anthony 575/455 = 1.264
Shawndre Jones 360/292 = 1.233
Trey Davis 146/123 = 1.187
Josh Jones 80/71 = 1.127
Deion Taylor 88/89 = 0.989
Combine that with no special defense or ball handling abilities.
Also, you have to look at Mooney's handling of him.
Mooney gave him less playing time than all the others above. Kadeem Smithen was next in line after him. Among the healthy division 1 players on our team, he was a last resort.
No offense to Josh Jones -- I hope he proves me wrong this year, but right now he looks too small to play the 3, and shoots too poorly to play the 2. So I think a successful season has 2 of Khwan/Julius/Jesse ahead of him on the guard depth chart.
But, by all means Josh, go become a 40% 3 pt shooter for us this year and make me look stupid.