Cheezus we have short memories. "Purvis is more talented than Bazz and Kemba." What? Taller and more athletic, yes. But Kemba and Bazz are in the league because of their talent. Tell me what weaknesses Bazz and Kemba had in their last seasons at UConn. Outside shooting? Passing? Free throws? Creating their own shot? Finishing near the rim? Rebounding? Leadership? Running the offense? No, no, no, no, no, no, no, and no. Those two have complete games. Purvis has some question marks and until we see them improve, there's little reason to think he's one and done at UConn. The NBA draft is not short on 6'2"/6'3" guards with great athleticism.
I also don't think we should be overselling the value of a redshirt year. This isn't football, and Purvis isn't a 7 footer who has only been playing for 2 years. Spending a year working on skills is spending a year not playing in real games. You can play in real games, and still work on your skills. Everything you do in a redshirt year you can do in a regular year, except you actually still get to play games.