The problem is different teams create different problems defensively.
Some teams have a quick lead guard at the point of attack (Ja, SGA, Brunson, Halliburton, Garland, Steph, Murray etc). Someone on Dallas needs to defend these guys. Right now the best bet is Caleb Martin and no one is mentioning him starting or even really in the rotation. Klay certainly can't guard them so a starting Flagg at SG seems unworkable unless you move Klay (to the bench or another team) and replace him with a ball hawking defender who can handle the ball.
Other teams lead with a bigger guard (Luka, ANT, Booker, Mitchell, Harden). Flagg should have a chance guarding these guys on switches but it's asking a lot of a 6' 9" rookie forward to take full-time responsibility here.
Wing point of attack (Tatum, Brown, Lebron, DeRozen, Butler, Kawhi, George) Flagg projects as a strong switchable defender but seems better suited to this type of primary matchup. Teams run offense through these guys but they're not usually the lead ball handler.
Some teams have a quick lead guard at the point of attack (Ja, SGA, Brunson, Halliburton, Garland, Steph, Murray etc). Someone on Dallas needs to defend these guys. Right now the best bet is Caleb Martin and no one is mentioning him starting or even really in the rotation. Klay certainly can't guard them so a starting Flagg at SG seems unworkable unless you move Klay (to the bench or another team) and replace him with a ball hawking defender who can handle the ball.
Other teams lead with a bigger guard (Luka, ANT, Booker, Mitchell, Harden). Flagg should have a chance guarding these guys on switches but it's asking a lot of a 6' 9" rookie forward to take full-time responsibility here.
Wing point of attack (Tatum, Brown, Lebron, DeRozen, Butler, Kawhi, George) Flagg projects as a strong switchable defender but seems better suited to this type of primary matchup. Teams run offense through these guys but they're not usually the lead ball handler.
![[-]](https://www.mavsboard.com/images/collapse.png)