I don't think it will be worth his time playing in Delray beach because after all its a 250 event
Sounds like an excellent warm-up tournament the week before Indian Wells. Even if he reaches the AO final, that'll be on 27 Jan. IW doesn't start until 4 March. Five weeks with no competitive tennis with two Masters looming is quite a gap. Also it would make sense that he use Delray to see where his game is after training with Lendl rather than wait until IW.