I thought it added in rookie holds as well since I couldn't figure out why there was the $8 million discrepancy between the sites. The salaries listed are the same on both sites for everyone and I did the math and kept coming up with the $78.418 million dollar figure for next year's salaries but then i found the mistake. They list Len's deal as a qualifying offer and factor that into their salaries, it's valued at $7.956 million. That amount makes up the difference between the 2 sites.
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Spotrac site does list cap holds but it doesn't list Len's because of that error. I'm not sure if that amount will be his cap hold or not but they list the cap holds for Monroe and Canaan if you scroll down towards the bottom. They'll have $28.371 million in cap holds, if Monroe is kept through the season. His hold is $26.826 million and Canaan's is just $1.544. I don't think they'll keep Monroe beyond this season, so they'll probably renounce that right away. Len and Canaan are a little different though, they could be kept but it's not a sure thing. If they renounce all free agents they could have $22.578 million in cap space, not counting rookie holds.
There is another difference between the sites that might be something to look for this summer, Spotrac lists Ulis and Big Sauce's contracts as non-guaranteed. I think both will be kept but that would allow them some more flexibility in terms of roster space, mainly. If Williams is let go that would free up another $5.5 million. However if you try to figure what the rookie cap holds are you can look at what Josh Jackson is making this season, he's getting $5.09 million as the #4 pick, which is around the same area where the Suns will pick again. So if you factor in around the same or a little less since #4 might be a little high based on the standings now their own pick will cost around $4-5 million and the Miami pick will probably be around $2-3 million. Factoring in those amounts the Suns will probably have around $14-15 million dollars to spend in free agency but I initially quoted that figure wrong since the site I used listed that incorrectly.