Dat2U wrote:15 out of the top 32 guards in the league last season according to EPMs EW (Estimated wins) statistic are 6-3 or less. This should kill the arguments against Sheppard & Dillingham due to size.
I think weight is more important than height once you get down to guys who are sub 6'-3". Let's face it, none of these guys are blocking anyone's shots, so what matters more is their ability to hold their position and absorb contact to help force a miss.
Here is a list of all the guards in this league who played 40+ games and averaged 10+ points and 4+ assists, arranged in order of weight. Unfortunately, weight listings are notoriously inaccurate. I provided their measured weight from the Combine when available. I put this list together to see if my theory passes the smell test. Does weight provide a better indicator of which little guy can hold up defensively?

A couple of notes.
- Trae Young's current listed weight is 14 pounds lighter than his rookie weight at the combine. I'm guessing the combine weight is wrong.
- Schroeder has a 6'8" wingspan which presumably helps him defend even at such a light weight.
- There is no chance Conley is still 175. He is way bulkier than his rookie weight.
- It seems like a lot of guys added 5 to 10 pounds since the combine, that's probably a good bet to assume for almost everyone. The ones that show no change probably just haven't updated their weight.
- I don't buy that Darius Garland is 192. I wish he was measured at the Combine
From this list, I'd say Trae Young is a true outlier. Nobody in the NBA is anywhere near as light as him. He also happens to be perhaps the worst defender in the league.
It looks like most of these guys eventually get to 190 pounds, at which point they can at least somewhat hold up in a switch.
I think this is relevant because Reed Sheppard weighed 181 at the Combine and will probably get to 190 given his frame. Rob Dillingham, on the other hand, weighed just 164 and does not have a frame to add weight. I think he really is a Trae Young tier defensive liability.