Last year the defense off the bench was poor though, and Daniels still doesn't replace ALL of what Posey was.
So your MAIN problem is that Daniels isn't Posey. Well, DUH. IF Ainge had wanted Posey and that contract he would have traded for him. But he didn't. And Posey looks to be in decline quite honestly.
The Celts need a backup PG sure, and they need another backup big who can guard the taller SFs in the league. But those are filler guys. Daniels is a quality backup who can slash and score. He's like Brian Shaw or Rickey Davis but without a 3 pt shot or the head issues. That's perfectly fine for the second unit and helps balance out the shooters we have in House and Wallace and hopefully Big Baby in unit 2.
I disagree that these guys HAVE to be filler guys. Why couldn't we fill one of those positions with a quality backup who will more fit our needs?
Aside from the fact that Daniels does fit our needs, how many quality backups who you think fill our needs better are available in our price range?
Couldn't have set it better. In fact, all the backups we listed that would be above Daniels, only Matt Barnes is below our price range (if the reported LLE signing is true). Anthony Parker, Grant Hill and Jamario Moon (who I actually think the Heat might match) are all getting paid above the LLE, for more years as well.