There is more to it than that.
Recruiting takes a certain level of commitment to what a coach is saying to you. Ali and Jackson felt comfortable enough to end their recruitment early and commit to UConn. Since we don't know how Coach Ollie recruited Ali and Jackson and what he said to them, so to make things easier I'll just use the consenus for what posters on the board seem to want for the class (2 guards, 1 big, 1 SF) and use it as Coach Ollie's sales pitch. If Ollie told Ali and Jackson that they would be the 2 guards in the class and he accepted their commitments then what reason does he still have to recruiting guards for? I understand keeping tabs on guys just in case but there seemed to a new offer to a new guard after game during evaluation period.
On the flip side, let's say at this time next year Ali and Jackson just enrolled to UConn and the staff is already on to the 2016 class then Coach Ollie doesn't owe Ali and Jackson anything since he kept his word about them being the only 2 guards in the 2015 class. If Ollie were to get 2 more guards in 2016 (say Tyus Battle and Derryck Thornton

) and they are better than Ali and Jackson and Ali and Jackson don't receive much playing time their sophomore year then it is their fault for not improving to the standards to the rest of the guards on the team.
Basically, what my extremely long point is is that if Coach Ollie thought there would be better guards out there then there was no need to allow Jackson and Ali to commit early only to recruit over them as if they weren't committed at all. I don't think recruiting over another player if he is already on the team is a problem. However, doing it while players are still in the recruitment process I don't think is okay.
* Of course assuming Jackson indeed decommit *