Yeah their 3-point numbers aren’t great, but all in a very small sample size. No reason to think they can’t or won’t improve significantly given development and opportunity.Josh is 4 for 23 (17.4%) in his career (A little funny that those three's stats from three are almost identical). I'm all for optimism, but it'd be pretty against the stats to expect those three to be on the floor at the same time and space the floor. And you can't expect driving lanes to be there if the defense can just sag off 2 or 3 players on the perimeter.
In your defense, those very well may be the best 5 players on the roster. I just don't think it works as a lineup. I'm more hopeful that Jones will be ready and can space the floor than for any of those three to drastically improve their shots. Hartwell and Gaines could be an intriguing combination to bring off the bench.