Cassell's JUCO freshman year:
2P FG 95-170 (55.9%), 6.3 points from 2Ps/game
3P 71-213 (33.3%), 7.1 points from 3P/game
FT 157-195 (80.5%), 5.2 points from FT/game
Jackson's JUCO freshman year:
2P FG 70-149 (47%), 4.4 points from 2Ps/game
3P 100-222 (45.5%), 9.4 points from 3Ps/game
FT 102-139 (73.4%), 3.2 points from FTs/game
What does this data show me? That in JUCO, Cassell didn't have a great outside jumper, but he took advantage of the sub-standard opposing defensive play and designed his offense by attacking the rim, especially since 11.5 ppg were generated from either 2 pt attempts or free throws. Now that Cassell is playing D1 basketball, against tougher opponents, he's not able to generate that same interior offense, thus forcing him to settle for more of an outside game, which he isn't that great in anyway.
The breakdown of Jackson's numbers make it look like he's more of an outside shooter. He doesn't generate a lot of free throw attempts (4.3/game compared to 6.5/game of Cassell), so I guess that his offensive game does not penetrate the interior often. He sticks to what he's good at, shooting threes, and the good news about 3 point shooters is that 3 point shooting ability translates better across different levels of play than lets say a guy like Cassell who was relying on attacking the rim in JUCO games.
If you can shoot a 3 in JUCO, you can probably shoot a 3 in D1 and with Gibbs and Calhoun both graduating, I'd gladly take a 3 point specialist and Jackson looks like he can help with that.