Here's my thoughts on this:
First of all, I don't think this is a coincidence at all. I think it was put out to hopefully start a bidding war. If it was done quietly, it would have been done with the usual suspects. I think the Spurs want to see what his value is and if it's worth it.
Second of all, you can eliminate Philly and Denver. The Spurs aren't going to trade him to somewhere he doesn't want to go. They are going to be as professional about this as possible. Where is the other place he really wanted to go. Phoenix. I think it starts there. Maybe that is where his heart is. He could be the man there. They have picks, young pieces, and veterans, all necessary components to make a serious offer.
Lastly, if he's not a Spur for life this is the best year to do it. As others have stated, his value is high. Personally I don't think the ethic is there for a player the Spurs want as a pillar. Build with faulty material and you have a bad investment. Also do you think the Spurs want to invest close to 30 mil on a declining player. Not saying he is now and his skill set suggests he could have a long and healthy career but I'm thinking in the terms of what Parker's last contract was. They gambled and now they are paying the price. Personally I think Gasol is a better player now than LMA is, and I'm factoring in team needs. Pau is the low post presence we want LMA to be and he can stretch the defense.
I'm gonna look at trade scenarios with Phoenix.