HadAnEffectHere wrote:Cason Wallace: 6'2.5", 6'8.5" wingspan, 195 pounds, very good lateral quickness
Reed Sheppard: 6'1", 6'3" wingspan, 187 pounds, so-so lateral quickness
This is pretty lazy analysis. Yeah let's just compare and evaluate players based on size, lateral quickness and call it a day. 
Lazy ! 
How about we dig deeper and look more closely at how they actually impact the game on the court? 
Let's talk not just athleticism but functional athleticism. You know, how their athleticism translates in actual basketball games. 

If Cason is bigger, stronger and has longer wingspan, then how is it that Sheppard had better steals %, blocks % and rebound % ? 
Hmm, maybe because basketball is about more than just physical tools. It's also about effort, hustle, having quick hands. Being able to read the ball coming off the rim, being able to read your man's hips to know which direction he is gonna drive the ball. Knowing your opponent's strengths/weaknesses, timing and anticipation for steals/blocks/rebounds, knowing when to gamble and go for a steal and when to stay home, having good technique when defending, having good technique when boxing out, etc. 
Cason might have better physical tools but looking at the numbers, the only thing he does better on a basketball court is dunk the ball. 
HadAnEffectHere wrote:Sheppard's major issue is that he's an elite help defender and bad 1 on 1 defender
Eh, that sounds like hyperbole to me. If he was *that* bad as a 1 on 1 defender, then why is he 1st on Kentucky's entire team in DBPM and 2nd in defensive rating? 
Also, if he's "bad" as an on ball defender, why does he get so many blocks? When you block someone's shot, that is on ball defense. Unless (on rare occasions) where you might fly in at the last second on help D. But most of Sheppard's blocks are on the ball..
Blocks % in college (for Dyson it's G league)
Sheppard: 2.8
M-Smart: 2.1
Lonzo: 2.1
Dyson Daniels: 2.0
Caruso: 1.8
A-Black: 1.8
D-Brooks: 1.7
Jrue: 1.7
Dennis Smith Jr: 1.2
J-Suggs: 1.1
Pat Bev: 0.9
Dejounte: 0.8
L-Dort: 0.8
K-Lowry: 0.6
CP3: 0.4
Sheppard also has a crazy high steals % and many of those steals are when playing on ball D. 
HadAnEffectHere wrote:What does Sheppard do when the Celtics focus their offense on getting a switch where Sheppard is guarding Jayson Tatum.
What's the plan then.
First off, that's a weird question because depending on what team drafts Sheppard, he might only play against the Celtics 2x a season. So who cares? And 1 of those games Tatum might be injured or resting. 
Also, many teams don't play a switch heavy defense. So if the team tries to switch Sheppard onto a certain offensive player, Sheppard's time could just, ya know...not switch. 
Also, teams try going after Payton Pritchard all the time..they try getting a matchup they want and try to have one of their better scores go iso on Pritchard - but Pritchard is scrappy and most of the time teams fail to score when they hunt him. He is able to hold his own pretty well in those situations. Last I checked his stats for iso defense are solid. 
And Sheppard is a much better defender than Pritchard was in college - especially when Pritchard was only a freshman.