It doesn't matter who guarded Finley on that play. A downscreen was set off of a baseline move. When that is done, the defender of the man who is one the screener needs to switch off. That didn't happen and that is how Finely got his shot off and that is how Nash got his shot off at the end of the second overtime.
This is basketball 101 guys.
Yes I know I am quoting myself. I didn't complete this thought.
Who was guarding Oberto on this play btw? It was probably Diaw, Shaq, or Amare.
If it is Shaq, there is simply no way he can show on a switch from a baseline screen. He doesn't have the lateral quickness to do it.
If it was Amare, I would be amazed here as well if he could have made the play.
If it was Diaw, well then he has the ability to get there and contest the shot.
My guess it was Amare or Shaq and in that case you have to just had credit to Popovich for exploiting the Suns weakness and to Finley for making the shot.
And remember, we did the exact same thing and got the exact same results with Nash in the 2nd overtime. Each time the player had to hit a difficult shot. That's the way basketball is sometimes.