Regarding Moses, something that should be mentioned is just how strong and powerful a human being he was. 6'10" 240-250 when at his best. Long, long arms. Few to none could move him off his position once he established it and he was so strong he established his position quite easily. And his knack at knowing where the ball was going to rebound it was almost on a Bill Russell and one other guy who I can't name's level. Moses was a beast
His finishing was incredible too, Moranis built a top offense with his two picks. Interesting to see how he will mitigate his defensive issues though.
So many great defensive players it really won't be that hard to supplement. At the end of the day, modern basketball offense is significantly more important than defense to crafting a championship level team.
Also, Moses isn't a bad defender (he isn't elite, but he can more than hold his own). In 83 (probably the year I will use, but maybe not) he was even a 1st Team All Defense along with his near-unanimous regular season MVP, the Finals MVP, 1st Team All NBA, etc. He led the league in rpg by nearly 3 rpg a game. He was 5th in scoring that year, which was a step back from prior years as he joined the Sixers for the first time and seamlessly integrated with their other HOF players. And it showed as the Sixers won 65 games and tore through the playoffs losing just 1 game as he coined fo, fo, fo, which became fo, fi, fo because of the actual results (that was the best playoff record in league history until the Shaq/Kobe Lakers and the Curry/Durant Warriors). So Moses sacrificed his scoring for the good of the team and the team won the title. That is exactly the type of player you want on this sort of team.
Moses was an absolute monster in the early 80's. He started young (and in the ABA) and played forever so his career per game numbers don't quite stack up with many of the other all time greats, but those last couple of seasons in Houston and the first couple in Philadelphia you would be hard pressed to find someone better than Moses.