Truth is, Grease was executive producer on X's last couple albums. They're family. Grease has been working with X for years on new music, but he and PK have had beef with Swizz over business shyt for years, over Swizz taking credit for tracks he didn't do. Grease never went anywhere. They were all working with X over the years when he was going through it. X was staying with Grease at his crib during that stretch, and the reason why they have issues, is because Swizz tries to make it seem like he's been the only one in X's corner all these years. Grease was behind all the business on X's last couple of projects and was giving X beats for free.
When X started working on this album years ago, he had tracks with Grease that they recorded at Vacant Lot. When they took the album back to Def Jam and got the budget for it, Swizz was named executive producer and cut all the tracks that Grease did off the project. He and X had done around 25-30 joints over the last few years. And that's been the issue with those two and the issue PK has with Swizz too because he blocked all of X's OG producers from the project once he got at the helm, but he brought in recycled beats from other dudes. Both Grease and PK have been online talking about this way before X passed, when Swizz flew X out to Cali to record at Snoop's spot. When Grease was executive producer on those last couple of X albums, he still brought in Swizz. When Swizz got the look, he cut both of the OG dudes out.