LW was as bad as Terrence on D
I don't think that's accurate based off of stats or the eye test. Lindell was no Monte on defense, but he was close to average for a starter according to Defensive Box Plus/Minus and Defensive Win Shares. Lewis has not been.
Now, stats like these are not easily comparable between a starting PG that got 33 minutes per game/6th man that got 26 MPG and a bench wing with inconsistent minutes.
That's why I mention the eyeball test.
Wigginton -
Without going back to review tape I remember Lindell being a ball-watcher when playing off the ball. He got some decent steals from that but also "got lost" and gave up layups or caused team defensive rotation breakdowns and open shots because of it.
When he was an on-ball defender in one-on-one situations he was good at disrupting ball handlers by staying in front and had pretty good hands too.
But with pick-and-roll defense he had issues getting over or around screens due to bad footwork. He would often meet a screener at a perpendicular angle and get stuck.
Pros and cons add up to be somewhat equal in the stat-Gods' eyes. In my opinion they tip toward the negative because I'd rather a point guard not gamble on defense unless they have supreme physical tools to do it. It puts more stress on your own defense to recover and puts you in scramble drill rotations.
Lewis -
We've all seen the struggles. It's become his narrative and a talking point for color commentators. He can physically be fine at defense. Maybe even pretty good. I remember watching his footwork as a freshman making closeouts and cutting off driving angles and being hopeful for him to grow in to a solid 3 and D guy. We see tiny glimpses of it when he's making high-effort, hustle plays on defense (and on the offensive glass).
Something has not clicked for him in this situation over the past 3 years (almost).
Links for reference. Look in the Advanced section for the two stats I mentioned above.
https://www.sports-reference.com/cbb/players/lindell-wigginton-1.html#all_players_advanced
https://www.sports-reference.com/cbb/players/terrence-lewis-2.html#all_players_advanced