I'm not really too worried, because after all, this is the preseason. Any little thing to a star player and they won't go, it's as simple as that. Why risk turning a little thing into something more?
I'm sure more than half (or all) of these injuries wouldn't cause anyone to miss any games if it happened in the regular season.
And this is kinda normal. Look around the league and many players sit out preseason games. LeBron and Wade are missing time, I'm sure Miami isn't too worried.
The only place to worry is Center. I really don't want to have to go small with KG and Baby on the floor together or use Erden in important games. JO and Shaq have to take care of their bodies and push themselves until Perk comes back. They will get their breather after the ASB. But for the first half they need to go all out.
The backup SF role will work itself out IMO. Daniels should hopefully not miss EXTENDED time, but a game here or there will be OK. Harangody and/or Lasme could play 10 minutes every once in awhile. If Daniels gets a serious injury, Danny probably looks into making a move.
Delonte isn't that much of a problem, as he should only play 15-20 minutes a game (maybe a few at PG). He will be relied on physically less this season than at any point in his career.