Key words were depending on who else they get. To be fair I should have added depending on who stays. Right now they have Rozier (top postgrad recruit, probably at least top 30 if a senior, may not return though, getting a good amount of NBA buzz already) Anton Gill played in 19 games and averaged 5 per game, he was a top 50 recruit), Snider is an incoming freshman and a McDAA).
Say Rozier leaves, that's still Snider and Gill as returning guards. Shaquaan Aaron could also play some two guard in a pinch.
Aside from that they are after another guard (Dozier, Blakeny, Ali, etc) who are all thought to be as good, or better than Mitchell.
Throw in that Mitchell isn't really a PG and has a streaky shot from distance, he likely will have stiff competition.
Also, I'm not sure he's a sure thing, top 30 player, but 30-60 sounds about right. Top 2-3 player in New England, for sure, I put him second after Adams but ahead of Enoch and Sharma.
They are also after some very good 2016 guards, who could jump Mitchell on the depth chart. I like Mitchell but all the guards at UL are top 30-50 type guards.