While I do believe he will join the team before training camp, I still dont understand why the hold up. I would think that all possible scenarios have been explored by Danny regarding a sign and trade with the Pacers by now, including the third team options.
The only thing that makes sense to me is that another player has possibly caught Danny's eye and he is waiting for some scenario to play out. This leading to a domino effect of signings with the sequence determined as players become 'no longer available'. I dont have a clue who these players would be however, so this could be a big reach.
The fact that we havent unloaded anyone (Tony Allen) and that their name hasnt been in the news leads one to assume that Danny is planning on keeping him ( Tony Allen) for this year at least until the trade deadline as part of a bigger package.