Yeah, I just really think Re:Coded wasn't really needed. They could have explained everything Re:Coded explained in the first five minutes of KH3D if they wanted to. Mickey finds mysterious message in Jiminy's Journal that has some hidden information magically inplanted, but the spell on the message prevents anyone from seeing the information. Mickey thinks Sora might be able to access the information since the journal is all about his adventures. Mickey summons Riku, Sora, and Kairi to Disney Castle. Sora touches the message and he is filled with all the information the data Namine revealed in Re:Coded. When Sora explains what he saw from the message, Mickey says they should speak to Yen Sid. Yen Sid reveals MX will return and so begins the mark of mastery exam and the rest of KH3D.
They should have used the data worlds concept and tie it into Ansem's data to make a game after KH3D that shows us how to rescue the people in torment. Basically the memories of Roxas, Xion, and Ven become data worlds and Sora goes through the worlds they have and you have things like the bugs in each world that were created by the pain of the people tied to Sora. Once Sora completes a data world he access memories of those connected to him and in the end he would find the meaning behind what Ansem told Aqua "So many are waiting for their new birth. Their birth by sleep". This whole journey into data and memories could have been a way for Sora to finally be approved of the mark of mastery. At the end of this game Sora and the others know realize what they have to do to save everyone and it ends with Sora looking up hopeful at the sky saying something like, "We're coming everyone." and so we have the lead in to KH3. Call the game "KH Coded" or "KH Reconnect" or if they had called BBS KH0, then we could have called it "KH Birth By Sleep" lol.