Where is the mention of the 4 sources?I believe he mentioned it on his radio segment on 1620There's only one single mention of this story.
https://twitter.com/NickESPN1480/status/670396059626004480
LJS, OWH, or even HOL (including Sean Callahan) do not mention it anywhere.
You also conveniently left out that Nick confirmed it with 4 different sources that were at practice. One of them could very well have been Sean Callahan.