Ok, I can see your confusion on that call. Crawford was definitely calling a block, but he makes a forward thrust with his arm first (which could be interpreted as a charge) but immediately calls the block.
Upon multiple reviews, it is certain that Crawford did not change the call:
1. His eyes are on the play the entire time, and his first arm thrust signifys the basket counts..that's the way he does it...he's a showman as a ref.
2. He immediately after throwing the arm thrust, then thrusts a hand toward the play to signify a foul occured there, then puts his hands to his waist to call that the foul was a block. No time to look at another ref to get confirmation...this call was all his. This is just looking at his arms and body.
3. His eyes and head go from the play to the blocking call without looking elsewhere, it is impossible that he's looking for another ref to confirm his call. Not humanly possible (although I think Joey is a demon) and there is no hesitation between arm out to show basket good and arms to waist to show blocking foul. That is clearly, CLEARLY a blocking foul called by Joey without any help from other officials.
4. Nash said in his postgame that Joey said he came under Kobe as he lifted, and therefore it was a block.
5. If you are looking at Kobe's questionable look that the foul may have been on him, super slo mo of the slo mo shows that Kobe's eyes are looking in the backcourt as Crawford makes the blocking call, then he looks at Crawford and sees a foul being called. He doesn't know if its on him or Nash, as it was really THAT close. Kobe's reaction gives no clue, as he was out of the view of the actual call, and knew it was close to begin with. Good call by Crawford, IMO, and he was the ref with the best view of the action.
Pretty solid evidence, IMO, that only Joey made the call and it wasn't something that he looked to other refs for guidance on. It was a bang-bang play. This was at 3:15 of the tape in the 4th, if you want to review for yourself. You'll note that Joey acted alone. Still not sure about whether Oswald did though...that film is kind of grainy.