This endless cycle is so exhausting, explaining the many underlying reasons to every new member who rocks up. We need a crash-course on Wario lore to direct people to.
Let me clear up one thing...
The folks who created Wario and Wario Land/Super Mario Land were not the same R&D1 members that headed the WarioWare franchise. Goro Abe and Yoshio Sakamoto were the key figures in the WarioWare franchise, but they played no part in Wario's original legacy. Don't confuse Wario's original R&D1 team with the WarioWare team.
The passing of the torch occurred at Wario Land 4, when Sakamoto and Abe were brought on to contribute. It was the end of an era and the dawn of WarioWare.