The Suns easily win the trade by becoming instantly relevant. If you're adding a top player and not giving up a top player you win the trade. I think it's as simple as that. I guess if you are worried about what that trade looks like 5 years down the road you hesitate but hindsight is always 20/20. Getting Irving for anyone on that Suns roster is an excellent trade for Phoenix. For Cleveland making their team deeper might also make sense.