I apologize if you already know this, but technically the Crowne Plaza does not connect, at least not now.
There is an uncovered walkway over the street to the convention center area, but that goes to the RCA Dome, which is about to be BLOOOWWWDDDD UUUPPP!
Ahem. Sorry about the previous sentence, I just couldn't resist.
Anyway, with the construction, over the next year to two years, the Crowne Plaza will probably not even have that walkway open, so if a connected hotel is of vital importance to you, my suggestion would be, as you already mentioned, the Hyatt, but also the Marriott and the Westin. The Canterbury is kind of/sort of connected, but that entrance is a real pain to use, goes through the Mall, which closes at 10 I think, and takes far longer than just directly walking.
Hope that helps.