Although I agree that JGood's best route to the NBA is via the point/lead guard spot, I'm not sure I buy into the argument that SLU would be the best option for him in this scenario.
I know that people point out Damian Lilliard as an example of going small, but the reality is that he's an extremely rare case. It's just not that common over these past 10 years for a non-P5 college guard to be drafted. For instance, over the past 10 years, the A10 has had 9 players drafted, two of whom were guards (Eric Maynor, Steph Curry both in 2009). By comparison, the B1G had 56 players drafted during this same time span, 15 of whom were guards. Others - CUSA (12 drafted, 2 guards), MVC (2 drafted, 0 guards taken including Fred Van Vleet).
Bottom line, the statistics just don't support going to a non-P5 school if the goal is to get drafted. And if JGood thinks he can work hard enough to be enough of a bad-!!! to get drafted from SLU, then I'm sure that same effort would get him plenty of tick at the lead guard for UI. Plus the exposure at a B1G school along with the level of competition is just so much more than at a non-P5 one, which I think is big for teams to project value and to determine draftability.