The thing about defense is you need a high level of dedication from a group of high motor defensive players. This team has a few like but they aren't good enough on offense to be played heavy minutes. For the schemes Vogel runs you need players that can go all out on defense. This team doesn't seem to have enough of those players.
On paper, Grayson Allen/Goodwin/Bates-Diop, they give you some considerable defense. I think longterm Vogel should begin to rely on them as the core around KD/Book. Our closing lineups have been awful. This is an area where we need to figure out who are the 3 guys next to KD/Book that can get it done.
Vogel's defensive schemes win championships, or the very least give you a championship level defense. The issue is that I don't think the team has the right players yet to get that defense. Vogel needs more players with grit like Allen, Goodwin, Bates-Diop but then he has to also be able to have a lineup on offense that is respectable around KD/Book such that KD/Book are not allowed to be doubled easily.
This is in part why I don't really like the Beal trade that much. I prefer the Ayton trade, it gave them some useful players that fit. The Beal trade only helps us if we first have the right balance on defense with enough depth. Then having a star third option like that would put you over the top.